Serveur Go : recherche GitHub par critères

- /api/search traduit les filtres en requête GitHub (langage, étoiles,
  activité, création, licence, topic, forks, archivés, good first issues)
- cache mémoire des recherches identiques (CACHE_TTL) et suivi du quota
- /api/status, /healthz, authentification basique optionnelle
- Dockerfile et docker-compose.yml

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

docker-compose.yml

@@ -0,0 +1,12 @@
+services:
+  searchgit:
+    build: .
+    container_name: searchgit
+    restart: unless-stopped
+    ports:
+      - "${HTTP_PORT:-8080}:8080"
+    environment:
+      GITHUB_TOKEN: ${GITHUB_TOKEN:-}   # optional: 30 searches/min instead of 10
+      CACHE_TTL: ${CACHE_TTL:-5m}       # identical searches are served from memory
+      AUTH_USER: ${AUTH_USER:-}         # leave empty to disable authentication
+      AUTH_PASS: ${AUTH_PASS:-}