Add per-release, per-language CodeQL API reference resources

[data-douser]

Extend server/src/resources/ to serve versioned, language-specific CodeQL API documentation as MCP resources.

Resource URI Scheme

codeql://api/{language}/{version}/{module}
codeql://api/java/2.24.0/dataflow
codeql://api/javascript/latest/ast

Implementation Design

1. Resource Registry (server/src/resources/api-reference.ts)

   • Define resource templates for each language × version × module combination
   • Support latest alias resolving to current CLI version
   • Map modules: ast, dataflow, taint, cfg, types

2. Documentation Sources

   • Fetch from CodeQL standard library QLDoc comments
   • Cache generated documentation in server/resources/api-cache/
   • Implement cache invalidation on version change

3. Dynamic Resource Generation

   • Use codeql resolve qlpacks to identify installed library versions
   • Extract QLDoc via codeql generate doc-index or direct QL parsing
   • Format as Markdown with class hierarchies and predicate signatures

4. Resource Registration

   • Register parameterized resources using MCP resource templates
   • Support filtering by language in resources/list responses

Acceptance Criteria

• Resources available for all 9 supported languages
• latest version alias works correctly
• Graceful fallback when docs unavailable for specific version
• Documentation cache reduces repeated generation overhead