Docs: Add post-mvp.md roadmap checklist with feature explanations

post-mvp.md

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+# Post-MVP Roadmap & Enhancements Checklist
+
+This checklist tracks future features, performance optimizations, and architectural enhancements planned for post-MVP releases.
+
+---
+
+## 🚀 Performance & Architecture
+
+- [ ] **Eliminate HTTP Polling (Replace with WebSockets / SSE / Real-Time Push)**
+  - **Explanation**: Currently, `App.jsx` uses a 5-second `setInterval` HTTP polling loop to fetch active run logs and server status. Replacing HTTP polling with Server-Sent Events (SSE) or WebSockets will eliminate redundant HTTP request overhead, reduce database query load, and push real-time backend updates to connected browser clients instantly.
+
+---
+
+## 🎨 User Experience & Real-Time Feedback
+
+- [ ] **Real-Time AI Evaluation Counter & UI Loading Status**
+  - **Explanation**: When a crawl run finishes scraping (e.g. 26 ads), the AI fields should reflect real-time LLM processing rather than jumping to 26 immediately.
+  - **Backend**: Celery worker (`evaluate_ad_batch_with_ai`) will increment `ads_evaluated_count` dynamically as each batch completes LLM calls.
+  - **Frontend**: Show an active loading status (e.g., `Evaluating AI... (5/26)`) in the Runs History table until all queued evaluations finish (`26/26 ✓`).
+
+---