Add multi-route HTTP service routing

[kacy]

Summary

• add multi-route HTTP routing for services while keeping the single-route shorthand
• persist service routes in a dedicated table and load them through the registry and runtime path
• materialize multiple routes per service in the proxy runtime and expose them in service JSON
• update the manifest reference and HTTP routing example for named route tables

Validation

• ran zig fmt on touched Zig files
• ran the skipped-slow test suite locally with YOQ_SKIP_SLOW_TESTS=1
• fixed the compile regressions found by that run
• fixed the skipped-slow proxy test stall by routing listener-bound slow tests through the existing skip path
• local skipped-slow validation progressed past the original proxy and control-plane stall point, but this shell environment did not yield a trustworthy final end-of-suite summary