Scaffold project and implement config, DB schema/queries

- Set up package.json (ESM, scripts), tsconfig.json, vitest.config.ts
- Install runtime and dev dependencies
- Add CLAUDE.md with architecture notes and code quality rules
- Config module with env var parsing and JWT_SECRET validation
- DB schema: users + files tables with FK cascade
- DB queries: createUser, getUserBy*, createFile, getFileById, getFilesByUserId, deleteFile
- Tests for config, db/users, db/files (15 tests passing)

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

package.json

@@ -2,10 +2,34 @@
   "name": "nanodrop",
   "version": "1.0.0",
   "description": "Simple file-sharing utility",
-  "main": "index.js",
+  "type": "module",
+  "main": "dist/index.js",
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "build": "tsc",
+    "dev": "tsx src/index.ts",
+    "test": "vitest run",
+    "test:watch": "vitest",
+    "register-user": "tsx src/cli/register-user.ts"
   },
   "author": "",
-  "license": "ISC"
+  "license": "ISC",
+  "dependencies": {
+    "@fastify/cookie": "^11.0.2",
+    "@fastify/formbody": "^8.0.2",
+    "@fastify/jwt": "^10.0.0",
+    "@fastify/multipart": "^9.4.0",
+    "@fastify/static": "^9.0.0",
+    "bcrypt": "^6.0.0",
+    "better-sqlite3": "^12.6.2",
+    "fastify": "^5.7.4",
+    "nanoid": "^5.1.6"
+  },
+  "devDependencies": {
+    "@types/bcrypt": "^6.0.0",
+    "@types/better-sqlite3": "^7.6.13",
+    "@types/node": "^25.3.3",
+    "tsx": "^4.21.0",
+    "typescript": "^5.9.3",
+    "vitest": "^4.0.18"
+  }
 }