feat(ui): add maintenance page for task management

* Implement maintenance page with task and log display
* Add backfill and metadata retry functionality
* Integrate grid component for project display in thoughts page
* Update types for maintenance tasks and logs
* Enhance sidebar and shell for new maintenance navigation

internal/app/admin_actions.go

@@ -0,0 +1,79 @@
+package app
+
+import (
+	"encoding/json"
+	"log/slog"
+	"net/http"
+
+	"git.warky.dev/wdevs/amcs/internal/tools"
+)
+
+type adminActions struct {
+	backfill *tools.BackfillTool
+	retry    *tools.EnrichmentRetryer
+	logger   *slog.Logger
+}
+
+func newAdminActions(backfill *tools.BackfillTool, retry *tools.EnrichmentRetryer, logger *slog.Logger) *adminActions {
+	return &adminActions{
+		backfill: backfill,
+		retry:    retry,
+		logger:   logger,
+	}
+}
+
+func (a *adminActions) backfillHandler() http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Method != http.MethodPost {
+			w.Header().Set("Allow", http.MethodPost)
+			http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
+			return
+		}
+
+		var in tools.BackfillInput
+		if err := json.NewDecoder(r.Body).Decode(&in); err != nil {
+			http.Error(w, "invalid request body", http.StatusBadRequest)
+			return
+		}
+
+		_, out, err := a.backfill.Handle(r.Context(), nil, in)
+		if err != nil {
+			if a.logger != nil {
+				a.logger.Warn("admin backfill failed", slog.String("error", err.Error()))
+			}
+			http.Error(w, err.Error(), http.StatusBadRequest)
+			return
+		}
+
+		w.Header().Set("Content-Type", "application/json")
+		_ = json.NewEncoder(w).Encode(out)
+	})
+}
+
+func (a *adminActions) retryMetadataHandler() http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Method != http.MethodPost {
+			w.Header().Set("Allow", http.MethodPost)
+			http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
+			return
+		}
+
+		var in tools.RetryEnrichmentInput
+		if err := json.NewDecoder(r.Body).Decode(&in); err != nil {
+			http.Error(w, "invalid request body", http.StatusBadRequest)
+			return
+		}
+
+		_, out, err := a.retry.Handle(r.Context(), nil, in)
+		if err != nil {
+			if a.logger != nil {
+				a.logger.Warn("admin metadata retry failed", slog.String("error", err.Error()))
+			}
+			http.Error(w, err.Error(), http.StatusBadRequest)
+			return
+		}
+
+		w.Header().Set("Content-Type", "application/json")
+		_ = json.NewEncoder(w).Encode(out)
+	})
+}