feat(bedrock): Integrate AWS Bedrock as a new LLM provider

Adds support for using models hosted on AWS Bedrock, specifically Anthropic Claude models.

Key changes:
- Added '@aws-sdk/client-bedrock-runtime' dependency.
- Updated constants, server config, and auth logic for Bedrock.
- Implemented backend API handler () to communicate with the Bedrock API, handling streaming and non-streaming responses, and formatting output to be OpenAI compatible.
- Updated dynamic API router () to dispatch requests to the Bedrock handler.
- Created frontend client () and updated client factory ().
- Updated  with necessary Bedrock environment variables (AWS keys, region, enable flag) and an example for using  to alias Bedrock models.

app/api/[provider]/[...path]/route.ts

@@ -14,6 +14,7 @@ import { handle as deepseekHandler } from "../../deepseek";
 import { handle as siliconflowHandler } from "../../siliconflow";
 import { handle as xaiHandler } from "../../xai";
 import { handle as chatglmHandler } from "../../glm";
+import { handle as bedrockHandler } from "../../bedrock";
 import { handle as proxyHandler } from "../../proxy";
 
 async function handle(
@@ -50,6 +51,8 @@ async function handle(
       return chatglmHandler(req, { params });
     case ApiPath.SiliconFlow:
       return siliconflowHandler(req, { params });
+    case ApiPath.Bedrock:
+      return bedrockHandler(req, { params });
     case ApiPath.OpenAI:
       return openaiHandler(req, { params });
     default: