feat: Add LinkedIn API posting + enhanced analyzer + schema

feat: Multi-platform batch generation + simple UI

feat: Simple HTML frontend with section copy buttons

fix: Handle missing correction fields + ResponseValidationError

feat: Add Grammar Correction API v2.1.0

fix: Raise HTTPException for unexpected errors instead of returning invalid dict

fix: Simplify prompts for 0.5B model reliability + resilient error handling

feat: Add multi-platform social media analysis with 7 platform-specific endpoints

Add critical error logging

Initial commit of SEO Analyzer FastAPI