feat: migrate gateway to nestjs

src/server/modules/proxy/proxy.controller.ts

@@ -0,0 +1,90 @@
+import { Controller, Get, Post, Body, Res, HttpStatus } from '@nestjs/common';
+import { FastifyReply } from 'fastify';
+import { ProxyService } from './proxy.service';
+import { Observable } from 'rxjs';
+import { OpenAIChatRequest, AnthropicChatRequest } from './interfaces/request-interfaces';
+
+@Controller('v1')
+export class ProxyController {
+  constructor(private readonly proxyService: ProxyService) {}
+
+  @Get('models')
+  getModels() {
+    return {
+      object: 'list',
+      data: [
+        // Gemini Native
+        {
+          id: 'gemini-2.5-flash-thinking',
+          object: 'model',
+          created: 1734336000,
+          owned_by: 'google',
+        },
+        { id: 'gemini-2.5-flash', object: 'model', created: 1734336000, owned_by: 'google' },
+        { id: 'gemini-2.5-pro', object: 'model', created: 1734336000, owned_by: 'google' },
+        { id: 'gemini-3-flash', object: 'model', created: 1734336000, owned_by: 'google' },
+
+        // Claude Native (Mapped)
+        { id: 'claude-sonnet-4-5', object: 'model', created: 1734336000, owned_by: 'anthropic' },
+        {
+          id: 'claude-sonnet-4-5-thinking',
+          object: 'model',
+          created: 1734336000,
+          owned_by: 'anthropic',
+        },
+
+        // Image Models
+        { id: 'gemini-3-pro-image', object: 'model', created: 1734336000, owned_by: 'google' },
+      ],
+    };
+  }
+
+  @Post('chat/completions')
+  async chatCompletions(@Body() body: OpenAIChatRequest, @Res() res: FastifyReply) {
+    try {
+      const result = await this.proxyService.handleChatCompletions(body);
+
+      if (body.stream && result instanceof Observable) {
+        res.header('Content-Type', 'text/event-stream');
+        res.header('Cache-Control', 'no-cache');
+        res.header('Connection', 'keep-alive');
+        res.send(result);
+      } else {
+        res.status(HttpStatus.OK).send(result);
+      }
+    } catch (error) {
+      const message = error instanceof Error ? error.message : 'Internal Server Error';
+      res.status(HttpStatus.INTERNAL_SERVER_ERROR).send({
+        error: {
+          message: message,
+          type: 'server_error',
+        },
+      });
+    }
+  }
+
+  @Post('messages')
+  async anthropicMessages(@Body() body: AnthropicChatRequest, @Res() res: FastifyReply) {
+    try {
+      const result = await this.proxyService.handleAnthropicMessages(body);
+
+      if (body.stream && result instanceof Observable) {
+        res.header('Content-Type', 'text/event-stream');
+        res.header('Cache-Control', 'no-cache');
+        res.header('Connection', 'keep-alive');
+        res.send(result);
+      } else {
+        res.status(HttpStatus.OK).send(result);
+      }
+    } catch (error) {
+      const message = error instanceof Error ? error.message : 'Internal Server Error';
+      res.status(HttpStatus.INTERNAL_SERVER_ERROR).send({
+        type: 'error',
+        error: {
+          type: 'api_error',
+          message: message,
+        },
+      });
+    }
+  }
+}