style: apply ruff format across backend + scripts (line-length 100)

Mechanical, whole-tree `ruff format` pass — no behaviour change. Recorded in
.git-blame-ignore-revs (next commit) so git blame skips it.

backend/app/downloads/pipeline.py

@@ -1,4 +1,5 @@
 """Child-side download/edit pipeline — the yt-dlp download + ffmpeg edit that runs in the spawned subprocess."""
+
 import logging
 import re
 import shutil
@@ -57,9 +58,7 @@ _YTDLP_TEMP_RE = re.compile(
 )
 
 
-def _notify_download_done(
-    db, user_id: int | None, title: str | None, job_id, *, kind: str
-) -> None:
+def _notify_download_done(db, user_id: int | None, title: str | None, job_id, *, kind: str) -> None:
     """Post a best-effort 'ready' notice to the owner's inbox — downloads/edits used to finish
     silently while scheduler jobs and playlist-push already notified (R11 feedback symmetry). A
     notification failure must never mask the completed job, so it is isolated + rolled back (mirrors
@@ -113,7 +112,7 @@ def _fill_asset_meta_early(asset_id: int, info: dict) -> None:
 
 def _make_progress_hook(job_id: int, asset_id: int):
     state = {"meta_done": False}
-    cancelled = _cancel_poll(job_id)          # same policy as the ffmpeg path
+    cancelled = _cancel_poll(job_id)  # same policy as the ffmpeg path
     allow_write = _rate_limiter(_DB_WRITE_INTERVAL_S)
 
     def hook(d: dict) -> None:
@@ -247,7 +246,9 @@ def _make_pp_hook(job_id: int):
 
     def hook(d: dict) -> None:
         if d.get("status") in ("started", "processing"):
-            _set_job(job_id, phase=_pp_phase(d.get("postprocessor") or ""), speed_bps=None, eta_s=None)
+            _set_job(
+                job_id, phase=_pp_phase(d.get("postprocessor") or ""), speed_bps=None, eta_s=None
+            )
 
     return hook
 
@@ -269,7 +270,9 @@ def _produced_file(info: dict, staging: Path) -> Path:
     back to the largest file left in staging that is neither a thumbnail nor one of yt-dlp's own
     working files (see `_YTDLP_TEMP_RE`)."""
     req = (info.get("requested_downloads") or [{}])[0]
-    fp = req.get("filepath") or req.get("_filename") or info.get("filepath") or info.get("_filename")
+    fp = (
+        req.get("filepath") or req.get("_filename") or info.get("filepath") or info.get("_filename")
+    )
     if fp:
         produced = Path(str(fp))
         if produced.is_file():
@@ -310,7 +313,9 @@ def _extract_with_fallback(job_id, asset_id, url, spec, staging, adapter):
     last_exc: Exception | None = None
     for i, clients in enumerate(client_sets):
         opts = formats.build_ydl_opts(
-            spec, outtmpl, _make_progress_hook(job_id, asset_id),
+            spec,
+            outtmpl,
+            _make_progress_hook(job_id, asset_id),
             extra=adapter.ydl_opts_extra(clients),
         )
         opts["postprocessor_hooks"] = [_make_pp_hook(job_id)]
@@ -324,7 +329,12 @@ def _extract_with_fallback(job_id, asset_id, url, spec, staging, adapter):
         except yt_dlp.utils.DownloadError as exc:
             last_exc = exc
             if i < len(client_sets) - 1 and adapter.retriable(str(exc)):
-                log.info("job %s: clients %s failed (%s); retrying with fallback", job_id, clients, str(exc)[:70])
+                log.info(
+                    "job %s: clients %s failed (%s); retrying with fallback",
+                    job_id,
+                    clients,
+                    str(exc)[:70],
+                )
                 for p in list(staging.iterdir()):  # drop partials before the retry
                     try:
                         p.unlink()
@@ -363,7 +373,9 @@ def _ensure_browser_playable(job_id: int, produced: Path, spec: dict, info: dict
 
     dest = produced.with_name(produced.stem + ".browser.mp4")
     action = "re-encode" if (reenc_v or reenc_a) else "remux"
-    log.info("job %s: %s (v=%s a=%s mp4=%s) -> browser-safe mp4", job_id, action, vcodec, acodec, is_mp4)
+    log.info(
+        "job %s: %s (v=%s a=%s mp4=%s) -> browser-safe mp4", job_id, action, vcodec, acodec, is_mp4
+    )
     _set_job(job_id, phase="processing", progress=0, speed_bps=None, eta_s=None)
     # Prefer the info duration; probe the file when the extractor didn't provide one, so a long
     # re-encode still shows real progress instead of a frozen 0%.
@@ -436,8 +448,12 @@ def _download(job_id: int, asset_id: int, source_kind: str, source_ref: str, spe
                 asset.width = int(info["width"]) if info.get("width") else None
                 asset.height = int(info["height"]) if info.get("height") else None
                 asset.container = ext
-                asset.vcodec = info.get("vcodec") if info.get("vcodec") not in (None, "none") else None
-                asset.acodec = info.get("acodec") if info.get("acodec") not in (None, "none") else None
+                asset.vcodec = (
+                    info.get("vcodec") if info.get("vcodec") not in (None, "none") else None
+                )
+                asset.acodec = (
+                    info.get("acodec") if info.get("acodec") not in (None, "none") else None
+                )
                 asset.title = meta.title
                 asset.uploader = meta.uploader
                 asset.uploader_url = adapter.uploader_url(info)
@@ -456,8 +472,13 @@ def _download(job_id: int, asset_id: int, source_kind: str, source_ref: str, spe
             job = db.get(DownloadJob, job_id)
             # Capture the owner before commit expires the row (avoids a refresh SELECT just to notify).
             owner_id = job.user_id if job else None
-            fields = {"status": JobStatus.DONE, "progress": 100, "phase": None, "speed_bps": None,
-                      "eta_s": None}
+            fields = {
+                "status": JobStatus.DONE,
+                "progress": 100,
+                "phase": None,
+                "speed_bps": None,
+                "eta_s": None,
+            }
             if job and not job.display_name and meta.title:
                 # display_name is VARCHAR(255) — clip a long title (see _fill_asset_meta_early).
                 fields["display_name"] = meta.title[:255]
@@ -484,8 +505,12 @@ def _download(job_id: int, asset_id: int, source_kind: str, source_ref: str, spe
             # Atomic fail: only while still running, so a route-set cancel/pause is never overwritten
             # with `error` (error also holds the asset → would re-open the double-release class).
             service.finalize_if_running(
-                db, job_id, status=JobStatus.ERROR, error=msg,
-                error_code=dlerrors.classify(msg), phase=None,
+                db,
+                job_id,
+                status=JobStatus.ERROR,
+                error=msg,
+                error_code=dlerrors.classify(msg),
+                phase=None,
             )
             db.commit()
         log.warning("job %s failed: %s", job_id, msg)
@@ -501,8 +526,12 @@ def _fail_edit(job_id: int, asset_id: int, msg: str) -> None:
             asset.error = msg
         # Atomic fail: only while still running (see the download error path).
         service.finalize_if_running(
-            db, job_id, status=JobStatus.ERROR, error=msg,
-            error_code=dlerrors.classify(msg), phase=None,
+            db,
+            job_id,
+            status=JobStatus.ERROR,
+            error=msg,
+            error_code=dlerrors.classify(msg),
+            phase=None,
         )
         db.commit()
     log.warning("edit job %s failed: %s", job_id, msg)
@@ -517,7 +546,9 @@ def _process_edit(job_id: int, asset_id: int) -> None:
         user_id = job.user_id if job else None
         src_ready = src is not None and src.status == "ready" and bool(src.rel_path)
         src_rel = src.rel_path if src else None
-        src_w, src_h, src_dur = (src.width, src.height, src.duration_s) if src else (None, None, None)
+        src_w, src_h, src_dur = (
+            (src.width, src.height, src.duration_s) if src else (None, None, None)
+        )
 
     if not src_ready or not src_rel:
         _fail_edit(job_id, asset_id, "The source download is no longer available.")
@@ -541,7 +572,9 @@ def _process_edit(job_id: int, asset_id: int) -> None:
 
         _set_job(job_id, phase="editing", progress=0, speed_bps=None, eta_s=None)
         if edit_spec.get("segments"):
-            cmd, prep = editmod.build_concat_plan(src_path, dest_staging, edit_spec, out_ext, staging)
+            cmd, prep = editmod.build_concat_plan(
+                src_path, dest_staging, edit_spec, out_ext, staging
+            )
             for p, content in prep.items():
                 p.write_text(content, encoding="utf-8")
         else: