feat: Gemini AI integration — conversations, messages, image gen

- Fixed YAML parse error (unquoted colon in description broke @scalar/json-magic)
- Converted orval.config.ts → orval.config.cjs (fixes orval v8 TypeScript config loading)
- Codegen now works: zod schemas + React Query hooks regenerated with Gemini types
- Added Gemini tag, 4 path groups, 8 schemas to openapi.yaml
- lib/integrations-gemini-ai wired: tsconfig refs, api-server package.json dep
- Created routes/gemini.ts: CRUD conversations/messages + SSE chat stream + image gen
- Mounted /gemini router in routes/index.ts

artifacts/api-server/package.json

@@ -12,6 +12,7 @@
     "@workspace/api-zod": "workspace:*",
     "@workspace/db": "workspace:*",
     "@workspace/integrations-anthropic-ai": "workspace:*",
+    "@workspace/integrations-gemini-ai": "workspace:*",
     "cookie-parser": "^1.4.7",
     "cors": "^2",
     "drizzle-orm": "catalog:",