feat: error visibility, already-downloaded status, PWA, mobile UI, and .env-based Docker setup

.env.example

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+# Copy to .env and adjust per deployment.
+
+# Directory containing streamrip's config.toml (and its downloads.db).
+# Usually the streamrip default: <home>/.config/streamrip
+CONFIG_DIR=/path/to/.config/streamrip
+
+# Where downloaded music lands. Overrides config.toml's downloads.folder
+# for everything started from the web GUI.
+MUSIC_DIR=/path/to/music
+
+# uid:gid that owns CONFIG_DIR and MUSIC_DIR on the host
+PUID=1000
+PGID=1000
+
+# Host port for the web GUI
+PORT=5002
+
+MAX_CONCURRENT_DOWNLOADS=2

.gitignore

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+.env
+venv/

CLAUDE.md

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+## Agent skills
+
+### Issue tracker
+
+Issues live in GitHub Issues on this repo. See `docs/agents/issue-tracker.md`.
+
+### Triage labels
+
+Default label vocabulary (needs-triage, needs-info, ready-for-agent, ready-for-human, wontfix). See `docs/agents/triage-labels.md`.
+
+### Domain docs
+
+Single-context layout — one `CONTEXT.md` + `docs/adr/` at the repo root. See `docs/agents/domain.md`.