Fix Docker build for native SQLite module

- Add python3, make, g++ for building better-sqlite3
- Use npm ci --ignore-scripts then npm rebuild better-sqlite3
- Remove postinstall script that caused build issues

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

package.json

@@ -9,8 +9,7 @@
     "lint": "eslint",
     "db:generate": "drizzle-kit generate",
     "db:migrate": "tsx src/lib/db/migrate.ts",
-    "db:studio": "drizzle-kit studio",
-    "postinstall": "npm run db:migrate"
+    "db:studio": "drizzle-kit studio"
   },
   "dependencies": {
     "@mozilla/readability": "^0.6.0",