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

lib/integrations-gemini-ai/package.json

@@ -0,0 +1,16 @@
+{
+  "name": "@workspace/integrations-gemini-ai",
+  "version": "0.0.0",
+  "private": true,
+  "type": "module",
+  "exports": {
+    ".": "./src/index.ts",
+    "./batch": "./src/batch/index.ts",
+    "./image": "./src/image/index.ts"
+  },
+  "dependencies": {
+    "@google/genai": "^1.44.0",
+    "p-limit": "^7.3.0",
+    "p-retry": "^7.1.1"
+  }
+}