feat: Add comprehensive Amazon Bedrock integration support

Add complete Amazon Bedrock integration to Claude Relay Service with:

## Core Features
- ✅ Bedrock account management with encrypted AWS credential storage
- ✅ Full request routing to AWS Bedrock with streaming support
- ✅ Integration with unified Claude scheduler system
- ✅ Support for Inference Profiles and Application Inference Profiles
- ✅ Configurable default and small-fast model settings

## Backend Services
- Add bedrockAccountService.js for account management
- Add bedrockRelayService.js for request forwarding
- Integrate Bedrock accounts into unifiedClaudeScheduler.js
- Update admin and API routes to support Bedrock endpoints
- Add comprehensive configuration options to config.example.js

## Frontend Integration
- Complete Vue.js Web UI for Bedrock account management
- Account creation form with AWS credentials and model configuration
- Real-time account status monitoring and statistics
- Edit/update capabilities for existing accounts

## CLI Support
- Interactive CLI commands for Bedrock account operations
- Account creation, listing, updating, and testing
- Status monitoring and connection validation

## Security & Performance
- AES encrypted storage of AWS credentials in Redis
- Support for temporary credentials (session tokens)
- Region-specific configuration support
- Rate limiting and error handling

This integration enables the relay service to support three AI platforms:
1. Claude (OAuth) - Original Claude.ai integration
2. Gemini - Google AI integration
3. Amazon Bedrock - New AWS Bedrock integration

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

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

src/services/claudeRelayService.js

@@ -559,7 +559,7 @@ class ClaudeRelayService {
       }
 
       req.on('error', (error) => {
-        console.error(": ❌ ", error);
+        console.error(': ❌ ', error);
         logger.error('❌ Claude API request error:', error.message, {
           code: error.code,
           errno: error.errno,
@@ -724,7 +724,7 @@ class ClaudeRelayService {
           });
           
           res.on('end', () => {
-            console.error(": ❌ ", errorData);
+            console.error(': ❌ ', errorData);
             logger.error('❌ Claude API error response:', errorData);
             if (!responseStream.destroyed) {
               // 发送错误事件