Add media-server OpenAPI specs & UI updates

Add upstream OpenAPI specs for Emby, Jellyfin and Plex under api_reference/ for adapter development, and add CLAUDE.md as a project overview. Update frontend components (ConfigPage.svelte, EnrichDialog.svelte, HistoryPage.svelte) and backend modules (api.rs, config.rs, media.rs, mining.rs, session.rs) to integrate enrichment, session tracking and configuration changes.

Author: bpwhelan

CLAUDE.md

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+# Nagare
+
+Subtitle mining tool for Emby / Jellyfin / Plex. A Rust (axum + tokio) backend
+watches media-server playback sessions and AnkiConnect, then enriches Anki cards
+with audio, screenshots, and sentence/translation context. A Svelte frontend
+provides the player-side UI and configuration.
+
+## Layout
+
+- `src/` — Rust backend
+  - `api.rs` — axum HTTP/WebSocket routes, enrichment pipeline (`perform_enrichment`)
+  - `config.rs` — `Config` and all persisted settings (serde). Stored as JSON in SQLite (`app_config`)
+  - `anki.rs` — AnkiConnect client + the poller/AnkiBeacon push loop (`run_anki_poller`)
+  - `mining.rs` — SQLite persistence (config, media history, mined notes)
+  - `session.rs` — media-server session tracking, history entries, subtitle loading
+  - `media.rs` — ffmpeg audio/screenshot/AVIF generation
+  - `subtitle.rs` — subtitle parsing + sentence-to-line matching
+  - `media_server/` — per-server adapters: `mediabrowser.rs` (Emby/Jellyfin), `plex.rs`, shared types in `mod.rs`
+- `frontend/src/` — Svelte app
+  - `lib/ConfigPage.svelte` — settings UI (tabbed: Server / Anki & Media / Frontend)
+  - `lib/EnrichDialog.svelte` — the card enrichment dialog
+  - `lib/stores.js`, `lib/api.js` — client state and backend calls
+- `api_reference/` — **third-party media-server OpenAPI specs** (see below)
+
+## API reference
+
+When working with the media-server adapters in `src/media_server/`, consult the
+upstream OpenAPI specifications in [`api_reference/`](api_reference/) rather than
+guessing endpoint shapes or field names:
+
+- `api_reference/emby_openapi.json` — Emby
+- `api_reference/jellyfin-openapi-stable.json` — Jellyfin
+- `api_reference/plex_openapi.json` — Plex
+
+These are large; search them for the specific endpoint/field instead of reading
+them whole.
+
+## Build & check
+
+- Backend: `cargo check` / `cargo build` / `cargo test` (run from repo root)
+- Frontend: `npm run build` (or `npm run dev`) from `frontend/`
+
+## Notes
+
+- Config is persisted via SQLite, not a flat file; `Config::save_to` is legacy.
+  The `mining.auto_approve` field is a migrated client-local setting and is
+  stripped server-side.
+- Series tagging (`anki.series_tag_parent`): when set, enrichment adds a
+  `parent::Series_Name` tag in `perform_enrichment`. The series name comes from
+  the media server's metadata (`NowPlaying.series_name`), plumbed through
+  `NowPlayingState` / `HistoryEntry` (persisted in the `media_history` table) and
+  `MediaContext`; movies fall back to the bare title.