Fix HttpService route precedence so Any("*") no longer shadows specific handlers

[Copilot]

HttpService::GetRoute(HttpRequest*, ...) iterated pathHandlers via std::unordered_map, so match order was non-deterministic. In practice, a catch-all Any("*") could win before concrete routes (e.g. /ping), breaking expected router behavior.

• Routing precedence in HttpService::GetRoute(HttpRequest*, ...)

  • Added explicit exact-path lookup first (pathHandlers.find(path)), with normal method resolution.
  • Refactored pattern matching into deterministic phases:
    • RESTful patterns (/:id, /{id}) first
    • wildcard patterns (*) after
  • Added stable ordering among pattern candidates (longer path first, then lexical tie-break) to avoid unordered-map iteration effects.

• Routing matcher extraction

  • Extracted route pattern matching into a helper (match_route_path) to keep wildcard + RESTful matching behavior consistent while making precedence explicit.

• Focused regression test

  • Added unittest/http_service_route_test.cpp and wired it into unittest/CMakeLists.txt.
  • Test asserts:
    • specific route /ping is selected over Any("*")
    • unknown path still falls through to catch-all

HttpService service;
service.Any("*", fallback_handler);
service.GET("/ping", specific_handler);

// /ping resolves to specific handler, not catch-all