Implement Phase 2 Frontend with Ant Design and verify Data Ingestion

- Created `frontend/` React+Vite app using Ant Design (Dark Theme).
- Implemented `App.jsx` to display listening history and calculated "Vibes".
- Updated `backend/app/ingest.py` to fix ReccoBeats ID parsing.
- Updated `backend/app/schemas.py` to expose audio features to the API.
- Updated `README.md` with detailed Docker hosting instructions.
- Added `TODO.md` for Phase 3 roadmap.
- Cleaned up test scripts.

TODO.md

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+# Future Roadmap & TODOs
+
+## Phase 3: AI Analysis & Insights
+
+### 1. Data Analysis Enhancements
+- [ ] **Timeframe Selection**:
+    - [ ] Update Backend API to accept timeframe parameters (e.g., `?range=30d`, `?range=year`, `?range=all`).
+    - [ ] Update Frontend to include a dropdown/toggle for these timeframes.
+- [ ] **Advanced Stats**:
+    - [ ] Top Artists / Tracks calculation for the selected period.
+    - [ ] Genre distribution charts (Pie/Bar chart).
+
+### 2. AI Integration (Gemini)
+- [ ] **Trigger Mechanism**:
+    - [ ] Add "Generate AI Report" button on the UI.
+    - [ ] (Optional) Schedule daily auto-generation.
+- [ ] **Prompt Engineering**:
+    - [ ] Design prompts to analyze:
+        - "Past 30 Days" (Monthly Vibe Check).
+        - "Overall" (Yearly/All-time evolution).
+    - [ ] Provide raw data (list of tracks + audio features) to Gemini.
+- [ ] **Storage**:
+    - [ ] Create `AnalysisReport` table to store generated HTML/Markdown reports.
+    - [ ] View past reports in a new "Insights" tab.
+
+### 3. Playlist Generation
+- [ ] **Concept**: "Daily Vibe Playlist" or "AI Recommended".
+- [ ] **Implementation**:
+    - [ ] Use ReccoBeats or Spotify Recommendations API.
+    - [ ] Seed with top 5 recent tracks.
+    - [ ] Filter by audio features (e.g., "High Energy" playlist).
+- [ ] **Action**:
+    - [ ] Add "Save to Spotify" button in the UI (Requires `playlist-modify-public` scope).
+
+### 4. Polish
+- [ ] **Mobile Responsiveness**: Ensure Ant Design tables and charts stack correctly on mobile.
+- [ ] **Error Handling**: Better UI feedback for API failures (e.g., expired tokens).