[Feature] API Route Discovery & Cross-Service Endpoint Linking

[spelech]

Added API route definition and client call site extraction across Python, JS/TS, Go, C#, and Java frameworks. Extended SQLite database schema with api_routes and api_client_calls tables and indexes. Implemented find_routes and find_api_callers FastMCP tools with path normalization, regex matching, and permalink linking. Added comprehensive unit and integration tests.

Fixes #2

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PR created automatically by Jules for task 5365465271942795610 started by @spelech

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[spelech]

Code Review: API Route Discovery & Cross-Service Endpoint Linking (PR #6)

✅ Verification & Findings:

• Multi-Framework Route Parsing: Successfully extracts route patterns across FastAPI, Express, Flask, ASP.NET, and Spring.
• Client Call-Site Discovery: Correctly extracts fetch, axios, requests, and HttpClient invocations into SQLite api_client_calls table.
• MCP Tools: Implements find_routes and find_api_callers with path normalization and source permalinks.
• Merged with Main & Test Verification: Successfully integrated with latest main (including ADR & Architecture changes). All 255 backend tests passing.

Ready for merge once CI checks pass.