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/src/image/client.ts

@@ -0,0 +1,47 @@
+import { GoogleGenAI, Modality } from "@google/genai";
+
+if (!process.env.AI_INTEGRATIONS_GEMINI_BASE_URL) {
+  throw new Error(
+    "AI_INTEGRATIONS_GEMINI_BASE_URL must be set. Did you forget to provision the Gemini AI integration?",
+  );
+}
+
+if (!process.env.AI_INTEGRATIONS_GEMINI_API_KEY) {
+  throw new Error(
+    "AI_INTEGRATIONS_GEMINI_API_KEY must be set. Did you forget to provision the Gemini AI integration?",
+  );
+}
+
+export const ai = new GoogleGenAI({
+  apiKey: process.env.AI_INTEGRATIONS_GEMINI_API_KEY,
+  httpOptions: {
+    apiVersion: "",
+    baseUrl: process.env.AI_INTEGRATIONS_GEMINI_BASE_URL,
+  },
+});
+
+export async function generateImage(
+  prompt: string
+): Promise<{ b64_json: string; mimeType: string }> {
+  const response = await ai.models.generateContent({
+    model: "gemini-2.5-flash-image",
+    contents: [{ role: "user", parts: [{ text: prompt }] }],
+    config: {
+      responseModalities: [Modality.TEXT, Modality.IMAGE],
+    },
+  });
+
+  const candidate = response.candidates?.[0];
+  const imagePart = candidate?.content?.parts?.find(
+    (part: { inlineData?: { data?: string; mimeType?: string } }) => part.inlineData
+  );
+
+  if (!imagePart?.inlineData?.data) {
+    throw new Error("No image data in response");
+  }
+
+  return {
+    b64_json: imagePart.inlineData.data,
+    mimeType: imagePart.inlineData.mimeType || "image/png",
+  };
+}

lib/integrations-gemini-ai/src/image/index.ts

@@ -0,0 +1 @@
+export { ai, generateImage } from "./client";