Add contractors by residence endpoint and Bruno API collection

- Add GET /contractors/by-residence/:residence_id/ endpoint
- Create comprehensive Bruno API collection (89 endpoints)
- Collection covers all API endpoints with Local and Dev environments

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

bruno-collections/casera-api/bruno.json

@@ -0,0 +1,9 @@
+{
+  "version": "1",
+  "name": "Casera API (Go)",
+  "type": "collection",
+  "ignore": [
+    "node_modules",
+    ".git"
+  ]
+}