fix: add MCPConfig json tag

[qiankunli]

Summary by Sourcery

Add and standardize JSON and YAML struct tags throughout MCP configuration types for consistent serialization

Enhancements:

• Add JSON tags to MCPConfig and all nested configuration structs to enable JSON serialization
• Normalize YAML tags for timestamp fields to use camelCase in MCPServer and MCPConfig
• Align JSON and YAML tags across RouterConfig, CORSConfig, ServerConfig, ToolConfig, MCPServerConfig, ArgConfig, and ItemsConfig for consistent field mappings

[sourcery-ai]

Reviewer's Guide

This PR introduces consistent JSON serialization by adding json tags alongside existing yaml tags and normalizing field naming (especially timestamps) across the MCPServer, MCPConfig, and all nested config types in internal/common/config/mcp.go.

File-Level Changes

Change	Details	Files
Added JSON tags and standardized YAML tags on top-level config structs	Added json tags to MCPServer.CreatedAt and UpdatedAt Added json tags to MCPConfig Name, Tenant, CreatedAt, UpdatedAt, DeletedAt Added json tags to MCPConfig slice fields (Routers, Servers, Tools, McpServers) Normalized yaml tags for timestamp fields to camelCase	internal/common/config/mcp.go
Added JSON tags and aligned YAML tags in nested types	Added json tags to RouterConfig and CORSConfig fields Added json tags to ServerConfig and ToolConfig fields Added json tags to MCPServerConfig for all fields Added json tags to ArgConfig and ItemsConfig Ensured yaml tags mirror json tag casing and include omitempty where applicable	internal/common/config/mcp.go

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[iFurySt]

LGTM! Thanks!

[sourcery-ai]

Hey @qiankunli - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Testing: all looks good
• 🟢 Documentation: all looks good

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