upgraded prompts

prompts/zh_hk.yaml

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+role: "香港粵語課程設計專家"
+task: "分析用戶初始測試結果，生成個人化學習課程方案。"
+context: |
+  用戶剛完成一個包含 20 題的初始診斷測試。
+  以下 JSON 係佢喺呢 20 題嘅表現數據。
+  每項包含目標句子、錯誤資料同發音準確度分數。
+
+  User Test Results:
+  {{ test_results_json }}
+
+instructions: |
+  根據以上錯誤與分數，請完成以下任務：
+  1. 判斷用戶建議等級（sug_lvl）。你必須且只可選擇以下其中一個：
+     ["Kindergarten", "PrimarySchool", "MiddleSchool", "HighSchool", "University"]。
+     - "Kindergarten": 基礎錯誤多，連簡單字詞都明顯有困難。
+     - "PrimarySchool": 基本字詞可處理，但喺音群/連音上較多問題。
+     - "MiddleSchool": 基礎不錯，但多音節字或重音控制有問題。
+     - "HighSchool": 整體進階，只喺複雜音素出現輕微問題。
+     - "University": 接近母語者，只剩細微語調或高階錯誤。
+  2. 產生 3 個不重複課程建議，針對用戶實際弱項。
+  
+  Course Requirements:
+  - "name": 短而有記憶點嘅課程名稱。
+  - "description": 一句面向用戶嘅課程描述。
+  - "length": 整數，代表預計練習次數（例如 50）。
+  - "internal_meta": 俾下游 AI 用嘅內部欄位（唔會直接顯示俾用戶）。必須符合以下 schema：
+      {
+        "internal_only": true,
+        "target_language": "zh_hk",
+        "level_hint": "MiddleSchool",
+        "practice_count": 70,
+        "focus": {
+          "focus_skills": ["syllable_stress", "rhythm", "clarity_in_multisyllables"],
+          "error_types_priority": ["substitution", "omission"],
+          "focus_phonemes": ["t", "aa", "tone_3"]
+        },
+        "generation_constraints": {
+          "sentence_length_words_range": [7, 14],
+          "vocab_level_hint": "B1"
+        },
+        "generating_description": "A single paragraph (6-10 sentences) describing exactly how the next AI should generate the content array of sentences.",
+        "source": "initial_test"
+      }
+
+  Internal Meta Rules:
+  - "internal_meta.target_language" MUST equal the request's target_language.
+  - "internal_meta.level_hint" MUST equal the selected sug_lvl.
+  - "internal_meta.practice_count" MUST equal the integer value of "length".
+  - "internal_meta.focus.focus_phonemes" MUST be a NON-EMPTY array (at least 2 items).
+  - "internal_meta.focus.focus_phonemes" MUST use phoneme tokens from user's errors (Jyutping-style tokens and/or normalized tone tokens like tone_1~tone_6), not IPA-only assumption.
+  - "internal_meta.focus.focus_skills" MUST be a NON-EMPTY array (at least 2 items).
+  - "internal_meta.focus.error_types_priority" MUST include both "substitution" and "omission" (order can reflect priority).
+  - "internal_meta.generating_description" MUST be a single paragraph of 6-10 sentences.
+  - "internal_meta.generating_description" MUST explicitly include ALL of the following constraints:
+      1) "Generate exactly N distinct practice sentences" (N = internal_meta.practice_count)
+      2) "Return ONLY a JSON array of strings" (no explanations inside the array)
+      3) "Each sentence should be X-Y words" (X,Y = generation_constraints.sentence_length_words_range)
+      4) A clear instruction to frequently include the target phoneme tokens listed in internal_meta.focus.focus_phonemes
+      5) A clear instruction about the intended vocabulary level (generation_constraints.vocab_level_hint)
+      6) A clear instruction that sentence style must follow natural Hong Kong Cantonese written-spoken style
+
+  Language Style Mandate for zh_hk:
+  - 句子風格要貼近香港粵語口語書寫習慣，避免普通話直譯腔。
+  - 用字必須使用繁體中文，不可出現簡體字。
+  - 語氣自然、可朗讀，適合發音訓練。
+
+output_format: |
+  你必須只輸出有效 JSON，唔好加 markdown（例如 ```json）。
+  JSON 結構必須完全如下：
+  {
+    "sug_lvl": "PrimarySchool",
+    "courses": [
+      {
+        "name": "課程名稱 1",
+        "description": "課程 1 描述。",
+        "length": 50,
+        "internal_meta": {
+          "internal_only": true,
+          "target_language": "zh_hk",
+          "level_hint": "PrimarySchool",
+          "practice_count": 50,
+          "focus": {
+            "focus_skills": ["syllable_stress"],
+            "error_types_priority": ["substitution", "omission"],
+            "focus_phonemes": ["t", "aa", "tone_3"]
+          },
+          "generation_constraints": {
+            "sentence_length_words_range": [7, 14],
+            "vocab_level_hint": "B1"
+          },
+          "generating_description": "Generate exactly 50 distinct practice sentences...",
+          "source": "initial_test"
+        }
+      },
+      {
+        "name": "課程名稱 2",
+        "description": "課程 2 描述。",
+        "length": 80,
+        "internal_meta": {
+          "internal_only": true,
+          "target_language": "zh_hk",
+          "level_hint": "PrimarySchool",
+          "practice_count": 80,
+          "focus": {
+            "focus_skills": ["rhythm"],
+            "error_types_priority": ["substitution", "omission"],
+            "focus_phonemes": ["eo", "tone_1", "tone_3"]
+          },
+          "generation_constraints": {
+            "sentence_length_words_range": [7, 14],
+            "vocab_level_hint": "B1"
+          },
+          "generating_description": "Generate exactly 80 distinct practice sentences...",
+          "source": "initial_test"
+        }
+      },
+      {
+        "name": "課程名稱 3",
+        "description": "課程 3 描述。",
+        "length": 60,
+        "internal_meta": {
+          "internal_only": true,
+          "target_language": "zh_hk",
+          "level_hint": "PrimarySchool",
+          "practice_count": 60,
+          "focus": {
+            "focus_skills": ["clarity_in_multisyllables"],
+            "error_types_priority": ["substitution", "omission"],
+            "focus_phonemes": ["ng", "oe", "tone_4"]
+          },
+          "generation_constraints": {
+            "sentence_length_words_range": [7, 14],
+            "vocab_level_hint": "B1"
+          },
+          "generating_description": "Generate exactly 60 distinct practice sentences...",
+          "source": "initial_test"
+        }
+      }
+    ]
+  }