Reorganize repo: backend/, deploy/, docs/ layout + AGENTS.md

Restructure the monorepo into clear top-level directories:
- backend/: Go module root (cmd, internal, pkg, configs, migrations,
  docs/swagger, scripts, tests, go.mod, Makefile, .air.toml)
- deploy/: Docker (Dockerfile, docker-compose*), quickstart, fluentd
- docs/: project documentation + reports/ (moved from repo root)
- AGENTS.md: new AI coding-agent guide at repo root

Update all references to the new layout:
- Dockerfile: COPY backend/go.mod, COPY backend/ (context = repo root)
- docker-compose files: context ../.., dockerfile deploy/docker/Dockerfile,
  env_file ../../.env, volume mounts ../../backend:/app
- deploy/quickstart/compose.yaml: dockerfile deploy/docker/Dockerfile
- CI: working-directory: backend for go commands, file deploy/docker/Dockerfile,
  coverage path backend/coverage.out, health_check backend/scripts/
- backend/Makefile: docker target uses -f ../deploy/docker/Dockerfile ../
- README: architecture tree, quickstart, config paths updated

Move root stray scripts (rename_models.*, run_m11_tests.sh, verify_build.sh,
gorm_bool_main.go) to backend/scripts/legacy/. All moves via git mv to
preserve history. Build, vet, SQLite tests, and docker compose config verified.

backend/internal/handler/api/v1/reporting_event_handler.go

@@ -0,0 +1,113 @@
+package v1
+
+import (
+	"net/http"
+	"strconv"
+	"time"
+
+	"github.com/gin-gonic/gin"
+
+	"github.com/gochat/gochat/internal/service"
+	"github.com/gochat/gochat/pkg/response"
+)
+
+// ReportingEventHandler handles reporting event API endpoints.
+// Reference: Chatwoot app/controllers/api/v1/accounts/reporting_events_controller.rb
+type ReportingEventHandler struct {
+	svc *service.ReportingEventService
+}
+
+// NewReportingEventHandler creates a new ReportingEventHandler.
+func NewReportingEventHandler(svc *service.ReportingEventService) *ReportingEventHandler {
+	return &ReportingEventHandler{svc: svc}
+}
+
+const chatwootReportingEventsPerPage = 25
+
+// List retrieves reporting events for an account with Chatwoot filters and pagination.
+// GET /api/v1/accounts/:account_id/reporting_events?since=...&until=...&inbox_id=...&user_id=...&name=...&page=...
+func (h *ReportingEventHandler) List(c *gin.Context) {
+	accountID, err := parseUintParam(c, "account_id")
+	if err != nil {
+		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid account_id")
+		return
+	}
+
+	filter, ok := parseReportingEventListFilter(c)
+	if !ok {
+		return
+	}
+
+	result, svcErr := h.svc.ListAccountEvents(c.Request.Context(), accountID, filter)
+	if svcErr != nil {
+		handleServiceError(c, svcErr)
+		return
+	}
+
+	payload := make([]gin.H, 0, len(result.Events))
+	for i := range result.Events {
+		payload = append(payload, serializeReportingEvent(result.Events[i]))
+	}
+	c.JSON(http.StatusOK, gin.H{
+		"payload": payload,
+		"meta": gin.H{
+			"count":        result.Total,
+			"current_page": result.CurrentPage,
+			"total_pages":  result.TotalPages,
+		},
+	})
+}
+
+func parseReportingEventListFilter(c *gin.Context) (service.ReportingEventListFilter, bool) {
+	page, err := strconv.Atoi(c.DefaultQuery("page", "1"))
+	if err != nil || page < 1 {
+		page = 1
+	}
+
+	inboxID, err := parseOptionalUintQueryParam(c, "inbox_id")
+	if err != nil {
+		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid inbox_id")
+		return service.ReportingEventListFilter{}, false
+	}
+	userID, err := parseOptionalUintQueryParam(c, "user_id")
+	if err != nil {
+		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid user_id")
+		return service.ReportingEventListFilter{}, false
+	}
+
+	filter := service.ReportingEventListFilter{
+		InboxID: inboxID,
+		UserID:  userID,
+		Name:    c.Query("name"),
+		Page:    page,
+		PerPage: chatwootReportingEventsPerPage,
+	}
+
+	sinceStr := c.Query("since")
+	untilStr := c.Query("until")
+	if sinceStr == "" || untilStr == "" {
+		return filter, true
+	}
+
+	since, err := parseUnixTimestamp(sinceStr)
+	if err != nil {
+		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid since date format")
+		return service.ReportingEventListFilter{}, false
+	}
+	until, err := parseUnixTimestamp(untilStr)
+	if err != nil {
+		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid until date format")
+		return service.ReportingEventListFilter{}, false
+	}
+	filter.Since = &since
+	filter.Until = &until
+	return filter, true
+}
+
+func parseUnixTimestamp(value string) (time.Time, error) {
+	seconds, err := strconv.ParseInt(value, 10, 64)
+	if err != nil {
+		return time.Time{}, err
+	}
+	return time.Unix(seconds, 0).UTC(), nil
+}