Merge feature/gemini-api branch

Resolves merge conflicts and integrates:
- Complete Gemini API translation layer
- Streaming and non-streaming endpoints
- Tool call accumulator for fragmented responses
- GitHub Actions test fix with query string imports
- Header mode configuration
- Debug logging improvements

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

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

Author: cuipengfei

src/routes/generate-content/translation.ts

@@ -536,7 +536,7 @@ export function translateOpenAIToGemini(
     },
   }
 
-  // Debug: Log original GitHub Copilot response and translated Gemini response for comparison
+  // Debug: Log original GitHub Copilot response and translated Gemini response
   if (process.env.DEBUG_GEMINI_REQUESTS === "true") {
     DebugLogger.logResponseComparison(response, result, {
       context: "Non-Stream Response Translation",

src/server.ts

@@ -27,6 +27,7 @@ server.route("/token", tokenRoute)
 server.route("/v1/chat/completions", completionRoutes)
 server.route("/v1/models", modelRoutes)
 server.route("/v1/embeddings", embeddingRoutes)
+server.route("/", geminiRouter)
 
 // Anthropic compatible endpoints
 server.route("/v1/messages", messageRoutes)

src/start.ts

@@ -125,12 +125,11 @@ export async function runServer(options: RunServerOptions): Promise<void> {
   consola.box(
     `🌐 Usage Viewer: https://ericc-ch.github.io/copilot-api?endpoint=${serverUrl}/usage`,
   )
-
   serve({
     fetch: server.fetch as ServerHandler,
     port: options.port,
     bun: {
-      idleTimeout: 255,
+      idleTimeout: 255, // gemini timeout
     },
   })
 }

tests/generate-content/streaming.test.ts

@@ -27,7 +27,10 @@ test("falls back to streaming when downstream returns non-stream JSON", async ()
     }),
   }))
 
-  const { server } = (await import("~/server")) as { server: TestServer }
+  await createMockRateLimit()
+  const { server } = (await import("~/server?fallback-non-streaming")) as {
+    server: TestServer
+  }
   const res = await server.request(
     "/v1beta/models/gemini-pro:streamGenerateContent",
     {