Add admin dashboard integration docs

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

ADMIN_DASH_INTEGRATION.md

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+# Admin Dashboard Integration
+
+How to integrate with the website container from an external admin dashboard.
+
+## 1. Uptime Check
+
+**GET** `http://website-container:3000/api/health`
+
+Returns:
+```json
+{ "status": "ok", "timestamp": "2026-02-09T05:19:53.468Z" }
+```
+
+- 200 = up, anything else (timeout, connection refused, non-200) = down
+- Both containers must be on the same Docker network for hostname resolution:
+
+```bash
+docker network create app-net
+docker network connect app-net website-container
+docker network connect app-net admin-dash-container
+```
+
+Alternatively, use `http://host.docker.internal:8080/api/health` to go through the host port mapping (no shared network needed, but adds overhead).
+
+## 2. Visitors Database
+
+The website writes visitor data to a SQLite DB at `/server_storage/visitors.db`. Mount the same host volume in the admin dashboard container (read-only):
+
+```bash
+docker run -d \
+  --name admin-dash-container \
+  -v /server_storage:/server_storage:ro \
+  admin-dash:latest
+```
+
+### Schema
+
+```sql
+CREATE TABLE visits (
+  id INTEGER PRIMARY KEY AUTOINCREMENT,
+  ip_address TEXT NOT NULL,    -- e.g. "2600:6c65:6740:..." or "18.199.106.183"
+  path TEXT NOT NULL,          -- e.g. "/", "/blog", "/resume"
+  visited_at TEXT NOT NULL     -- UTC datetime, e.g. "2026-02-09 05:19:53"
+);
+```
+
+### Reading from the DB
+
+The DB uses WAL mode, so reads won't block the website's writes. Open in **read-only** mode to avoid conflicts:
+
+```typescript
+// Node.js with better-sqlite3
+import Database from 'better-sqlite3';
+const db = new Database('/server_storage/visitors.db', { readonly: true });
+const visits = db.prepare('SELECT * FROM visits ORDER BY visited_at DESC LIMIT 100').all();
+```
+
+```python
+# Python with sqlite3
+import sqlite3
+conn = sqlite3.connect('file:///server_storage/visitors.db?mode=ro', uri=True)
+visits = conn.execute('SELECT * FROM visits ORDER BY visited_at DESC LIMIT 100').fetchall()
+```
+
+### Useful Queries
+
+```sql
+-- Unique visitors today
+SELECT COUNT(DISTINCT ip_address) FROM visits
+WHERE visited_at >= date('now');
+
+-- Page view counts
+SELECT path, COUNT(*) as views FROM visits
+GROUP BY path ORDER BY views DESC;
+
+-- Visits per hour (last 24h)
+SELECT strftime('%Y-%m-%d %H:00', visited_at) as hour, COUNT(*) as views
+FROM visits WHERE visited_at >= datetime('now', '-1 day')
+GROUP BY hour ORDER BY hour;
+```
+
+## Docker Compose Example
+
+```yaml
+services:
+  website:
+    image: my-website:latest
+    ports:
+      - "8080:3000"
+    volumes:
+      - /server_storage:/server_storage
+    networks:
+      - app-net
+
+  admin-dash:
+    image: admin-dash:latest
+    ports:
+      - "3333:3000"
+    volumes:
+      - /server_storage:/server_storage:ro
+    networks:
+      - app-net
+
+networks:
+  app-net:
+```