feat(transcoding): add FFmpeg HLS transcoding support

- Introduced `TranscodeManager` for managing on-demand transcoding of local video files.
- Added configuration options for transcoding in `Config` and `LocalFilesConfig`.
- Implemented new API routes for managing transcoding settings, stats, and cache.
- Updated `LocalFilesProvider` to support transcoding capabilities.
- Created frontend components for managing transcode settings and displaying stats.
- Added database migration for transcode settings.
- Enhanced existing routes and DTOs to accommodate new transcoding features.

k-tv-frontend/hooks/use-transcode.ts

@@ -0,0 +1,43 @@
+"use client";
+
+import { useMutation, useQuery, useQueryClient } from "@tanstack/react-query";
+import { api } from "@/lib/api";
+import { useAuthContext } from "@/context/auth-context";
+import type { TranscodeSettings } from "@/lib/types";
+
+export function useTranscodeSettings() {
+  const { token } = useAuthContext();
+  return useQuery({
+    queryKey: ["transcode-settings"],
+    queryFn: () => api.transcode.getSettings(token!),
+    enabled: !!token,
+  });
+}
+
+export function useUpdateTranscodeSettings() {
+  const { token } = useAuthContext();
+  const qc = useQueryClient();
+  return useMutation({
+    mutationFn: (data: TranscodeSettings) =>
+      api.transcode.updateSettings(data, token!),
+    onSuccess: () => qc.invalidateQueries({ queryKey: ["transcode-settings"] }),
+  });
+}
+
+export function useTranscodeStats() {
+  const { token } = useAuthContext();
+  return useQuery({
+    queryKey: ["transcode-stats"],
+    queryFn: () => api.transcode.getStats(token!),
+    enabled: !!token,
+  });
+}
+
+export function useClearTranscodeCache() {
+  const { token } = useAuthContext();
+  const qc = useQueryClient();
+  return useMutation({
+    mutationFn: () => api.transcode.clearCache(token!),
+    onSuccess: () => qc.invalidateQueries({ queryKey: ["transcode-stats"] }),
+  });
+}