feat: add simple image generation API for canvas integration

- New /api/generate-image endpoint that returns base64 directly
- Uses RunPod proxy to bypass geo-restrictions
- Enables canvas-website MycroZine tool to generate images
- Includes CORS headers for cross-origin requests

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

web/app/api/generate-image/route.ts

@@ -0,0 +1,171 @@
+import { NextRequest, NextResponse } from "next/server";
+
+/**
+ * Simple image generation API that proxies to RunPod/Gemini
+ * Returns base64 image data directly (no file storage)
+ * Used by canvas-website MycroZine tool
+ */
+export async function POST(request: NextRequest) {
+  try {
+    const body = await request.json();
+    const { prompt } = body;
+
+    if (!prompt) {
+      return NextResponse.json(
+        { error: "Missing required field: prompt" },
+        { status: 400 }
+      );
+    }
+
+    // Generate image via RunPod proxy
+    const imageBase64 = await generateImageWithRunPod(prompt);
+
+    if (!imageBase64) {
+      return NextResponse.json(
+        { error: "Image generation failed" },
+        { status: 500 }
+      );
+    }
+
+    return NextResponse.json(
+      {
+        success: true,
+        imageData: imageBase64,
+        mimeType: "image/png",
+      },
+      {
+        headers: {
+          "Access-Control-Allow-Origin": "*",
+          "Access-Control-Allow-Methods": "POST, OPTIONS",
+          "Access-Control-Allow-Headers": "Content-Type",
+        },
+      }
+    );
+  } catch (error) {
+    console.error("Image generation error:", error);
+    return NextResponse.json(
+      { error: error instanceof Error ? error.message : "Failed to generate image" },
+      { status: 500 }
+    );
+  }
+}
+
+async function generateImageWithRunPod(prompt: string): Promise<string | null> {
+  const apiKey = process.env.GEMINI_API_KEY;
+  const runpodApiKey = process.env.RUNPOD_API_KEY;
+  const runpodEndpointId = process.env.RUNPOD_GEMINI_ENDPOINT_ID || "ntqjz8cdsth42i";
+
+  if (!apiKey) {
+    console.error("GEMINI_API_KEY not configured");
+    return null;
+  }
+
+  if (!runpodApiKey) {
+    console.error("RUNPOD_API_KEY not configured, trying direct API");
+    return generateDirectGeminiImage(prompt, apiKey);
+  }
+
+  const runpodUrl = `https://api.runpod.ai/v2/${runpodEndpointId}/runsync`;
+
+  try {
+    const response = await fetch(runpodUrl, {
+      method: "POST",
+      headers: {
+        "Content-Type": "application/json",
+        "Authorization": `Bearer ${runpodApiKey}`,
+      },
+      body: JSON.stringify({
+        input: {
+          api_key: apiKey,
+          model: "gemini-2.0-flash-exp",
+          contents: [
+            {
+              parts: [
+                {
+                  text: `Generate an image: ${prompt}`,
+                },
+              ],
+            },
+          ],
+          generationConfig: {
+            responseModalities: ["TEXT", "IMAGE"],
+          },
+        },
+      }),
+    });
+
+    if (!response.ok) {
+      const errorText = await response.text();
+      console.error("RunPod API error:", response.status, errorText);
+      return null;
+    }
+
+    const result = await response.json();
+    const data = result.output || result;
+
+    if (data.error) {
+      console.error("Gemini API error via RunPod:", data.error);
+      return null;
+    }
+
+    // Extract image from response
+    const parts = data.candidates?.[0]?.content?.parts || [];
+    for (const part of parts) {
+      if (part.inlineData?.mimeType?.startsWith("image/")) {
+        console.log("Generated image via RunPod proxy");
+        return part.inlineData.data;
+      }
+    }
+
+    console.error("No image in response");
+    return null;
+  } catch (error) {
+    console.error("RunPod request error:", error);
+    return null;
+  }
+}
+
+async function generateDirectGeminiImage(prompt: string, apiKey: string): Promise<string | null> {
+  const geminiUrl = `https://generativelanguage.googleapis.com/v1beta/models/gemini-2.0-flash-exp:generateContent?key=${apiKey}`;
+
+  try {
+    const response = await fetch(geminiUrl, {
+      method: "POST",
+      headers: { "Content-Type": "application/json" },
+      body: JSON.stringify({
+        contents: [{ parts: [{ text: `Generate an image: ${prompt}` }] }],
+        generationConfig: { responseModalities: ["TEXT", "IMAGE"] },
+      }),
+    });
+
+    if (!response.ok) {
+      console.error("Direct Gemini API error:", response.status);
+      return null;
+    }
+
+    const data = await response.json();
+    const parts = data.candidates?.[0]?.content?.parts || [];
+    for (const part of parts) {
+      if (part.inlineData?.mimeType?.startsWith("image/")) {
+        return part.inlineData.data;
+      }
+    }
+
+    return null;
+  } catch (error) {
+    console.error("Direct Gemini error:", error);
+    return null;
+  }
+}
+
+// Allow CORS for canvas-website
+export async function OPTIONS() {
+  return new NextResponse(null, {
+    status: 200,
+    headers: {
+      "Access-Control-Allow-Origin": "*",
+      "Access-Control-Allow-Methods": "POST, OPTIONS",
+      "Access-Control-Allow-Headers": "Content-Type",
+    },
+  });
+}