Codec-aware transcode routing, two-stage queue, request candidate picker, admin reorg

- Requests approval now shows a Radarr/Sonarr candidate picker instead of grabbing the first search result (fixes wrong-title/wrong-year matches)
- approve_request reuses an existing Radarr/Sonarr entry instead of erroring when content is already in the library
- New codec-check queue (step 1) probes source codecs and skips transcoding entirely for already browser-native files; only non-native content reaches the transcode queue (step 2)
- Fixes ffmpeg hard-failing on non-H.264 sources via the h264_mp4toannexb bitstream filter (root cause of the fix-audio-all failures)
- Added Codec Check Worker / Transcode Worker to the services health panel with restart
- Reorganized the admin page into Pipeline/Utilities dropdowns; added the missing Sonarr Import link
- Bumped VERSION 1.0.0 -> 1.1.0

backend/models.py

@@ -193,6 +193,8 @@ class RequestUpdate(BaseModel):
 
 class RequestApprove(BaseModel):
     content_type: str  # "movie" | "tv"
+    tmdb_id: Optional[int] = None  # movie: explicit pick from /requests/{id}/candidates
+    tvdb_id: Optional[int] = None  # tv: explicit pick from /requests/{id}/candidates
 
 
 class MovieRequest(BaseModel):
@@ -380,6 +382,26 @@ class TranscodeJob(BaseModel):
     finished_at: Optional[str] = None
 
 
+class CodecCheckJob(BaseModel):
+    """Step 1 of the pipeline, ahead of TranscodeJob (step 2): probes the source file's actual
+    video/audio codecs and decides whether it needs a transcode at all. 'native' sources skip
+    straight to the library with no transcode job ever created; 'audio'/'abr' sources get
+    handed off to a TranscodeJob."""
+    model_config = ConfigDict(extra="ignore")
+    id: str = Field(default_factory=lambda: str(uuid.uuid4()))
+    movie_id: str  # generic content id (movie_id OR episode_id, depending on content_type)
+    movie_title: str = ""
+    content_type: str = "movie"  # movie | episode
+    status: str = "pending"  # pending | running | done | failed | cancelled | superseded
+    classification: Optional[str] = None  # native | audio | abr, set once done
+    error: str = ""
+    triggered_by: str = "manual"
+    superseded_by: Optional[str] = None
+    created_at: str = Field(default_factory=_now_iso)
+    started_at: Optional[str] = None
+    finished_at: Optional[str] = None
+
+
 class QueuePauseToggle(BaseModel):
     paused: bool