Add essential LLM prompt files for golf swing analysis

- models/prompts.py: Utility to load coach prompt template from markdown
- models/coach_prompt.md: Comprehensive coaching prompt template for LLM analysis

These files are required for the AI-powered golf swing coaching functionality
and were missing from the previous commit.

app/models/coach_prompt.md

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+# Golf Swing Analysis
+
+## PROFESSIONAL BENCHMARKS FOR CALIBRATION
+Use these professional standards as your 100% reference for scoring. These represent elite-level golf swing mechanics based on actual LPGA Tour professional analysis:
+
+### Professional Golfer Analysis Summary (100% Reference Standards):
+
+**Atthaya Thitikul (LPGA Tour - Elite Level):**
+- Hip Rotation: 63.4°, Shoulder Rotation: 120°, Posture Score: 98.2%
+- Weight Shift: 88.4%, Arm Extension: 99.8%, Wrist Hinge: 120°
+- Energy Transfer: 96.1%, Power Accumulation: 100%, Potential Distance: 295 yards
+- Sequential Kinematic Sequence: 100%, Swing Plane Consistency: 85%
+
+**Nelly Korda (LPGA Tour - Elite Level):**
+- Hip Rotation: 90°, Shoulder Rotation: 120°, Posture Score: 97.4%
+- Weight Shift: 73.5%, Arm Extension: 96.7%, Wrist Hinge: 114.8°
+- Energy Transfer: 91.2%, Power Accumulation: 100%, Potential Distance: 289 yards
+- Sequential Kinematic Sequence: 100%, Swing Plane Consistency: 85%
+
+**Demi Runas (Professional Level):**
+- Hip Rotation: 63.4°, Shoulder Rotation: 120°, Posture Score: 95.9%
+- Weight Shift: 63.9%, Arm Extension: 96.6%, Wrist Hinge: 93.4°
+- Energy Transfer: 88.0%, Power Accumulation: 100%, Potential Distance: 286 yards
+- Sequential Kinematic Sequence: 100%, Swing Plane Consistency: 85%
+
+**Rose Zhang (LPGA Tour Professional):**
+- Hip Rotation: 90°, Shoulder Rotation: 120°, Posture Score: 98.0%
+- Weight Shift: 89.9%, Arm Extension: 79.5%, Wrist Hinge: 112.8°
+- Energy Transfer: 96.6%, Power Accumulation: 100%, Potential Distance: 296 yards
+- Sequential Kinematic Sequence: 100%, Swing Plane Consistency: 85%
+- Speed Generation: Body-dominant
+
+**Lydia Ko (LPGA Tour Professional):**
+- Hip Rotation: 90°, Shoulder Rotation: 120°, Posture Score: 99.2%
+- Weight Shift: 66.2%, Arm Extension: 62.1%, Wrist Hinge: 120°
+- Energy Transfer: 88.7%, Power Accumulation: 100%, Potential Distance: 286 yards
+- Sequential Kinematic Sequence: 100%, Swing Plane Consistency: 70%
+- Speed Generation: Body-dominant
+
+### **PROFESSIONAL STANDARDS CALIBRATION (100% Level):**
+**Core Biomechanical Metrics:**
+- **Hip Rotation**: 25-90° (Professional range - multiple successful approaches)
+- **Shoulder Rotation**: 60-120° (Professional upper body coil range)
+- **Posture Score**: 95-99% (Exceptional spine angle consistency across all professionals)
+- **Weight Shift**: 53-90% (Professional range varies significantly by style)
+
+**Upper Body Excellence:**
+- **Arm Extension**: 62-100% (Wide professional range - Lydia shows low extension can work)
+- **Wrist Hinge**: 93-120° (Optimal lag and release timing)
+- **Swing Plane Consistency**: 70-85% (Professional-level repeatability)
+- **Chest Rotation Efficiency**: 66-100% (Coordination varies by swing style)
+
+**Power & Efficiency Markers:**
+- **Energy Transfer Efficiency**: 65-97% (Wide professional range - multiple successful approaches)
+- **Power Accumulation**: 84-100% (Power generation across all styles)
+- **Sequential Kinematic Sequence**: 69-100% (Professional coordination standards)
+- **Potential Distance**: 242-296 yards (Professional power range)
+
+**Movement Quality Standards:**
+- **Head Movement**: 1-8 inches (Controlled movement varies by professional)
+- **Ground Force Efficiency**: 53-90% (Professional ground interaction range)
+- **Hip Thrust**: 30-100% (Lower body drive varies significantly)
+
+### **AMATEUR REFERENCE EXAMPLES FOR CALIBRATION:**
+
+**70% Level Skilled Amateur (Female):**
+- Hip Rotation: 23.0°, Shoulder Rotation: 120° (Excellent shoulder turn, limited hip mobility)
+- Posture Score: 89.5%, Weight Shift: 90.0% (Strong fundamentals)
+- Arm Extension: 99.8%, Wrist Hinge: 49.4° (Great extension, needs more lag)
+- Energy Transfer: 94.5%, Power Accumulation: 82.1% (Very good coordination)
+- Potential Distance: 273 yards, Sequential Kinematic: 93.6%
+- Head Movement: 8.0in lateral, 6.0in vertical (Excessive movement)
+- Speed Generation: Mixed
+
+**50-60% Level Amateur (Female - Arms-Dominant):**
+- Hip Rotation: 25°, Shoulder Rotation: 60° (Limited body rotation)
+- Posture Score: 80.6%, Weight Shift: 50.0% (Needs improvement)
+- Arm Extension: 94.8%, Wrist Hinge: 116.6° (Good extension, excellent lag)
+- Energy Transfer: 56.8%, Power Accumulation: 89.3% (Mixed efficiency)
+- Potential Distance: 241 yards, Sequential Kinematic: 66.8%
+- Head Movement: 3.0in lateral, 2.0in vertical (Good head control)
+- Ground Force: 50.0%, Hip Thrust: 30.0% (Weak lower body)
+- Speed Generation: Arms-dominant
+
+**CRITICAL INSIGHTS FROM PROFESSIONAL AND AMATEUR ANALYSIS:**
+1. **Hip Rotation Shows Variation**: Professionals range from 63-90°, with moderate rotation (63°) and full rotation (90°) both achieving elite results
+2. **Shoulder Rotation Critical Threshold**: 120° consistently achieved by all professionals, showing this as the elite standard
+3. **Multiple Successful Swing Styles**: Body-dominant swings both achieve elite results with different hip mobility approaches
+4. **Posture Consistency Universal**: All professionals maintain 95-99% posture scores regardless of swing style
+5. **Arm Extension Varies Dramatically**: Professional range 62-100% shows that both high extension (96-100%) and compact swings (62%) can be highly effective
+6. **Energy Transfer Multiple Pathways**: Range from 88-97% in professionals, showing consistent high-level power generation approaches
+7. **Power Accumulation Excellence**: All professionals achieve 100% efficiency, showing this as the elite standard
+8. **Distance Generation Diversity**: Professional distances range 285-296 yards through different mechanical approaches
+9. **Weight Transfer Success Patterns**: Professional range 63-90% shows multiple effective weight shift strategies
+10. **Sequential Timing Excellence**: Professional kinematic sequence consistently at 100%, showing perfect coordination as the standard
+11. **Wrist Hinge Consistency**: Professionals range 93-120°, showing different but effective lag and release strategies
+12. **Ground Force Utilization Excellence**: Range 63-90% with elite players achieving consistent high efficiency through proper lower body mechanics
+
+## CURRENT SWING ANALYSIS
+
+### Swing Phase Breakdown
+{swing_phase_data}
+
+### Core Body Mechanics
+{core_mechanics}
+
+### Upper Body Mechanics
+{upper_body}
+
+### Lower Body Mechanics
+{lower_body}
+
+### Movement Quality & Timing
+{movement_quality}
+
+## ANALYSIS INSTRUCTIONS
+
+**GOLF SWING ANALYSIS FORMAT**
+Use the benchmarks above to guide your evaluation. Follow this exact format:
+
+**PERFORMANCE_CLASSIFICATION:** [XX%]
+(XX = number from 10% to 100%)
+
+**Metric Evaluations**
+
+For each of the 5 core metrics below, write exactly 3 sentences evaluating the metric:
+1. First sentence: State if it's good, bad, or needs improvement compared to elite standards
+2. Second sentence: Compare the specific value to professional ranges  
+3. Third sentence: Brief explanation of impact on swing performance
+
+**1. Tempo Ratio Evaluation:**
+[3 sentences about tempo ratio]
+
+**2. Shoulder Rotation @ Top Evaluation:**
+[3 sentences about shoulder rotation at top of backswing]
+
+**3. Hip Rotation @ Impact Evaluation:**
+[3 sentences about hip rotation at impact]
+
+**4. X-Factor @ Top Evaluation:**
+[3 sentences about X-Factor (shoulder-hip separation) at top]
+
+**5. Posture Score Evaluation:**
+[3 sentences about overall posture throughout swing]
+
+**SCORING GUIDELINES (Use to help decide % score)**
+
+| Metric | Professional Standard | Note |
+|--------|----------------------|------|
+| Hip Rotation | 25°–90° | <25° is weak |
+| Shoulder Rotation | 60°–120° | <60° is weak |
+| Energy Transfer | 65–97% | <65% = score <60% |
+| Sequential Kinematics | 69–100% | <69% = score <70% |
+| Weight Shift | 53–90% | <53% = weakness |
+| Head Movement | 1–8 in | >8 in = major issue |
+| Arm Extension | 62–100% | <62% = weakness |
+| Power Accumulation | 84–100% | <84% = weakness |
+
+**Classification Bands:**
+- **90–100%**: Tour-level
+- **80–89%**: Advanced amateur
+- **70–79%**: Skilled
+- **60–69%**: Intermediate
+- **50–59%**: Developing
+- **40–49%**: Beginner
+- **10–39%**: Novice
+
+**STYLE & FORMATTING RULES:**
+- Use these headers: PERFORMANCE_CLASSIFICATION, Metric Evaluations, and the 5 numbered metric sections
+- No emojis anywhere in the response
+- Write exactly 3 sentences for each metric evaluation
+- Tie all evaluations to professional standards and ranges
+- Use a positive, coaching tone throughout
+- Avoid saying "perfect" — say "strong" or "meets standards"
+- Focus on biomechanics and compare actual values to pro ranges
+
+

app/models/prompts.py

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+"""
+Prompt templates for LLM analysis
+"""
+from pathlib import Path
+
+def load_coach_prompt():
+    """Load the coach prompt template from markdown file"""
+    prompt_file = Path(__file__).with_name("coach_prompt.md")
+    return prompt_file.read_text()
+
+COACH_PROMPT = load_coach_prompt()