feat(CF-567): Add project key validation to prevent corrupt data

- Add PROJECT_KEY_REGEX for valid format (2-5 uppercase letters)
- Add validateProjectKey() and isValidProjectKey() functions
- Update getProjectKey() to validate input and generated keys
- Reject invalid formats with clear error messages

Invalid formats now rejected:
- Single letters (A, C, U)
- Numbers (1, 20, 123)
- Full names (ClaudeFramework, Circles)
- Mixed case (Circles)
- Too long (>5 chars)

Also fixes Sentry SDK v8 API changes (httpIntegration, postgresIntegration).

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

package.json

@@ -12,9 +12,10 @@
   },
   "dependencies": {
     "@modelcontextprotocol/sdk": "^1.0.4",
+    "@sentry/node": "^9.47.1",
+    "@sentry/profiling-node": "^10.37.0",
     "dotenv": "^17.2.3",
-    "pg": "^8.11.3",
-    "@sentry/node": "^9.19.1"
+    "pg": "^8.11.3"
   },
   "devDependencies": {
     "@types/node": "^20.11.0",