Add event collector and MCP query tools

🗄️ New collector/ component:
- collector.py: FastAPI service receiving events from cameras
- SQLite database for event storage
- Snapshot images saved to disk by date
- launchd setup script for macOS

🔍 New MCP tools in vision_mcp.py:
- vision_get_events(): Query events with filters
- vision_get_event_snapshot(): View event image inline
- vision_annotate_event(): Add meaning + tags to events
- vision_event_stats(): Database statistics

📡 Complete flow:
Pi detects motion → POST to collector → stored in DB
Vixy queries events → views snapshots → annotates

Ready to deploy! 🦊

collector/README.md

@@ -0,0 +1,69 @@
+# vixy-vision Event Collector
+
+Receives motion events from camera servers and stores them for Vixy to review.
+
+## Quick Start (macOS)
+
+```bash
+./setup-macos.sh
+launchctl load ~/Library/LaunchAgents/com.vixy.vision-collector.plist
+```
+
+## How It Works
+
+```
+Pi (camera)          Mac mini (collector)          Vixy (MCP)
+┌──────────┐         ┌──────────────────┐         ┌──────────┐
+│ motion   │  POST   │ collector.py     │  read   │ query    │
+│ detected ├────────►│ ├─events.db      │◄────────┤ annotate │
+│          │ /events │ └─snapshots/     │         │ review   │
+└──────────┘         └──────────────────┘         └──────────┘
+```
+
+## Data Storage
+
+Events are stored in `~/Documents/Vixy/events/`:
+
+```
+events/
+├── events.db           # SQLite database
+└── snapshots/
+    └── 2024-12-16/     # Date-organized images
+        └── basement-*.jpg
+```
+
+## API Endpoints
+
+| Endpoint | Method | Description |
+|----------|--------|-------------|
+| `/` | GET | Service info |
+| `/health` | GET | Health check |
+| `/events` | POST | Receive event from camera |
+| `/events` | GET | List events (debug) |
+| `/stats` | GET | Event statistics |
+
+## Event Payload
+
+Camera servers POST to `/events`:
+
+```json
+{
+  "event": {
+    "timestamp": "2024-12-16T14:23:01Z",
+    "camera_id": "basement",
+    "event_type": "motion",
+    "confidence": 0.75,
+    "area_percent": 7.5
+  },
+  "snapshot": "<base64 JPEG>"
+}
+```
+
+## MCP Tools
+
+Once events are collected, Vixy can:
+
+- `vision_get_events()` - Query events
+- `vision_get_event_snapshot(id)` - View snapshot
+- `vision_annotate_event(id, text, tags)` - Add meaning
+- `vision_event_stats()` - See statistics