feat(files): every file sits in a library folder, and keeps its own expiry

The Files library starts here. A user's every download, clip and upload now
lands in a source folder made per origin (YouTube, Plex clips, uploads, one per
other site), decided once in downloads/folders.py at every place a job is made.
How long a file stays moves from the shared asset to the user's job: stamped
from its folder when it is done, never for a file the user keeps. The GC warns
each user once, then takes the expired file out of their library; the cache cap
never evicts a kept file, and an evicted one leaves every holder's library.

The media mount is /files now (FILES_ROOT, FILES_HOST_PATH, volume
siftlode_files); docs/self-hosting.md says how to carry an old volume over.
Migration 0102 places every existing job and carries each done file's expiry
over from its asset.

safe_abs_path takes a missing path and answers None, which drops one baselined
type error.

docker-compose.yml

@@ -37,7 +37,7 @@ services:
       DATABASE_URL: postgresql+psycopg://${POSTGRES_USER:-siftlode}:${POSTGRES_PASSWORD:-siftlode}@db:5432/${POSTGRES_DB:-siftlode}
       # Download center: the API serves finished files + builds filmstrips; the worker (below) runs
       # the yt-dlp job loop.
-      DOWNLOAD_ROOT: /downloads
+      FILES_ROOT: /files
       WORKER_ENABLED: "false"
     depends_on:
       db:
@@ -45,9 +45,9 @@ services:
     ports:
       - "${APP_PORT:-8080}:8000"
     volumes:
-      # Downloaded media. Defaults to a Docker-managed named volume; set DOWNLOAD_HOST_PATH in .env
+      # Downloaded media. Defaults to a Docker-managed named volume; set FILES_HOST_PATH in .env
       # to a host directory (e.g. one your Plex server reads) to keep the Plex-style tree there.
-      - ${DOWNLOAD_HOST_PATH:-downloads}:/downloads
+      - ${FILES_HOST_PATH:-files}:/files
       # Plex library, read-only. The Plex module streams files itself, so it needs to SEE them: set
       # PLEX_MEDIA_HOST_PATH in .env to the host directory holding the library (the local side of the
       # admin "path map", whose default is /data=/plex-media). Left unset it falls back to an empty
@@ -80,7 +80,7 @@ services:
     environment:
       DATABASE_URL: postgresql+psycopg://${POSTGRES_USER:-siftlode}:${POSTGRES_PASSWORD:-siftlode}@db:5432/${POSTGRES_DB:-siftlode}
       SCHEDULER_ENABLED: "false"
-      DOWNLOAD_ROOT: /downloads
+      FILES_ROOT: /files
       WORKER_ENABLED: "true"
     depends_on:
       db:
@@ -91,7 +91,7 @@ services:
       bgutil-pot:
         condition: service_started
     volumes:
-      - ${DOWNLOAD_HOST_PATH:-downloads}:/downloads
+      - ${FILES_HOST_PATH:-files}:/files
       # Same read-only Plex library as the API — the worker resolves library paths too.
       - ${PLEX_MEDIA_HOST_PATH:-plex_media}:/plex-media:ro
     logging: *logging
@@ -107,6 +107,6 @@ services:
 
 volumes:
   pgdata:
-  downloads:
+  files:
   # Empty fallback for the Plex media mount when PLEX_MEDIA_HOST_PATH is unset (Plex module off).
   plex_media: