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/Residences/Join With Code.bru

@@ -0,0 +1,21 @@
+meta {
+  name: Join With Code
+  type: http
+  seq: 7
+}
+
+post {
+  url: {{api_url}}/residences/join-with-code/
+  body: json
+  auth: none
+}
+
+headers {
+  Authorization: Token {{auth_token}}
+}
+
+body:json {
+  {
+    "code": "ABC123"
+  }
+}