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/Notifications/Unread Count.bru

@@ -0,0 +1,15 @@
+meta {
+  name: Unread Count
+  type: http
+  seq: 2
+}
+
+get {
+  url: {{api_url}}/notifications/unread-count/
+  body: none
+  auth: none
+}
+
+headers {
+  Authorization: Token {{auth_token}}
+}