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>

internal/handlers/contractor_handler.go

@@ -181,6 +181,27 @@ func (h *ContractorHandler) GetContractorTasks(c *gin.Context) {
 	c.JSON(http.StatusOK, response)
 }
 
+// ListContractorsByResidence handles GET /api/contractors/by-residence/:residence_id/
+func (h *ContractorHandler) ListContractorsByResidence(c *gin.Context) {
+	user := c.MustGet(middleware.AuthUserKey).(*models.User)
+	residenceID, err := strconv.ParseUint(c.Param("residence_id"), 10, 32)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid residence ID"})
+		return
+	}
+
+	response, err := h.contractorService.ListContractorsByResidence(uint(residenceID), user.ID)
+	if err != nil {
+		if errors.Is(err, services.ErrResidenceAccessDenied) {
+			c.JSON(http.StatusForbidden, gin.H{"error": err.Error()})
+			return
+		}
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+	c.JSON(http.StatusOK, response)
+}
+
 // GetSpecialties handles GET /api/contractors/specialties/
 func (h *ContractorHandler) GetSpecialties(c *gin.Context) {
 	specialties, err := h.contractorService.GetSpecialties()