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/api-spec/orval.config.cjs

@@ -0,0 +1,66 @@
+const path = require("path");
+
+const root = path.resolve(__dirname, "..", "..");
+const apiClientReactSrc = path.resolve(root, "lib", "api-client-react", "src");
+const apiZodSrc = path.resolve(root, "lib", "api-zod", "src");
+
+const titleTransformer = (config) => {
+  config.info ??= {};
+  config.info.title = "Api";
+  return config;
+};
+
+module.exports = {
+  "api-client-react": {
+    input: {
+      target: path.resolve(__dirname, "./openapi.yaml"),
+      override: {
+        transformer: titleTransformer,
+      },
+    },
+    output: {
+      workspace: apiClientReactSrc,
+      target: "generated",
+      client: "react-query",
+      mode: "split",
+      baseUrl: "/api",
+      clean: true,
+      prettier: true,
+      override: {
+        fetch: {
+          includeHttpResponseReturnType: false,
+        },
+        mutator: {
+          path: path.resolve(apiClientReactSrc, "custom-fetch.ts"),
+          name: "customFetch",
+        },
+      },
+    },
+  },
+  zod: {
+    input: {
+      target: path.resolve(__dirname, "./openapi.yaml"),
+      override: {
+        transformer: titleTransformer,
+      },
+    },
+    output: {
+      workspace: apiZodSrc,
+      client: "zod",
+      target: "generated",
+      schemas: { path: "generated/types", type: "typescript" },
+      mode: "split",
+      clean: true,
+      prettier: true,
+      override: {
+        zod: {
+          coerce: {
+            query: ["boolean", "number", "string"],
+            param: ["boolean", "number", "string"],
+          },
+        },
+        useDates: true,
+      },
+    },
+  },
+};