feat: add HTTP proxy, custom CA, metrics exposure, and category filtering

- Add createHttpAgent() for proxy/CA support via undici
- Thread dispatcher through all registry sources
- Add collectMetrics() for SRE metrics exposure
- Add caPath to RegistryClientConfig
- Add category field to RegistryServer with Glama extraction
- Add category filtering in client search
- Add pr.sh for Gitea PR creation

63 tests passing (13 new).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

pnpm-lock.yaml

@@ -59,6 +59,9 @@ importers:
       js-yaml:
         specifier: ^4.1.0
         version: 4.1.1
+      undici:
+        specifier: ^7.22.0
+        version: 7.22.0
       zod:
         specifier: ^3.24.0
         version: 3.25.76
@@ -1807,6 +1810,10 @@ packages:
   undici-types@7.18.2:
     resolution: {integrity: sha512-AsuCzffGHJybSaRrmr5eHr81mwJU3kjw6M+uprWvCXiNeN9SOGwQ3Jn8jb8m3Z6izVgknn1R0FTCEAP2QrLY/w==}
 
+  undici@7.22.0:
+    resolution: {integrity: sha512-RqslV2Us5BrllB+JeiZnK4peryVTndy9Dnqq62S3yYRRTj0tFQCwEniUy2167skdGOy3vqRzEvl1Dm4sV2ReDg==}
+    engines: {node: '>=20.18.1'}
+
   unpipe@1.0.0:
     resolution: {integrity: sha512-pjy2bYhSsufwWlKwPc+l3cN7+wuJlK6uz0YdJEOlQDbl6jo/YlPi4mb8agUkVC8BF7V8NuzeyPNqRksA3hztKQ==}
     engines: {node: '>= 0.8'}
@@ -3580,6 +3587,8 @@ snapshots:
 
   undici-types@7.18.2: {}
 
+  undici@7.22.0: {}
+
   unpipe@1.0.0: {}
 
   uri-js@4.4.1: