feat: implement RSS subscriptions, downloader routing and local media checks

.env.example

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+# Copy values into your shell, or source a private .env file before cargo run.
+# This application does not automatically load .env files.
+APP_PORT=8080
+DATABASE_URL=sqlite://data/ani.db
+POLL_INTERVAL_SECONDS=300
+RUST_LOG=info
+
+# Website requests (Mikan pages/covers, RSS and torrent metadata).
+# Unset means direct; HTTP_PROXY/HTTPS_PROXY/ALL_PROXY/NO_PROXY are NOT inherited.
+MIKAN_BASE_URL=https://mikanani.me
+# WEBSITE_PROXY_URL=http://127.0.0.1:7897
+# WEBSITE_PROXY_URL=socks5h://127.0.0.1:7897
+# Optional URL-encoded credentials: http://username:password@host:port
+# Comma-separated explicit direct exceptions; empty by default.
+# WEBSITE_DIRECT_HOSTS=localhost,127.0.0.1,::1
+# qBittorrent control connections always remain direct.
+
+# Initial import only, when the database has no downloader instances.
+# Existing instances and the global selection are managed through /api/downloaders.
+# When upgrading, these MUST identify the original downloader of existing jobs.
+# Unset on a fresh installation leaves jobs unassigned until first selection.
+# QBIT_URL=http://127.0.0.1:8081
+# QBIT_USERNAME=admin
+# QBIT_PASSWORD=replace-me
+# Path as seen by qBittorrent, not by this Rust process.
+# QBIT_SAVE_PATH=/downloads