restructure to react spa + hono api, fix missing server/ and lib/

rewrite from monolithic hono jsx to react 19 spa with tanstack router
+ hono json api backend. add scan, review, execute, nodes, and setup
pages. multi-stage dockerfile (node for vite build, bun for runtime).

previously, server/ and src/shared/lib/ were silently excluded by
global gitignore patterns (/server/ from emacs, lib/ from python).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.env.example

@@ -0,0 +1,41 @@
+# netfelix-audio-fix — environment configuration
+# Copy this file to .env and fill in your values.
+# Bun auto-loads .env on every start; .env.development/.env.test/.env.production
+# are loaded additionally for the matching NODE_ENV.
+#
+# When JELLYFIN_URL + JELLYFIN_API_KEY are set, the setup wizard is skipped.
+# JELLYFIN_USER_ID is optional — omit it when using an admin API key (uses /Items directly).
+
+# ── Server ────────────────────────────────────────────────────────────────────
+PORT=3000
+DATA_DIR=./data
+
+# ── Jellyfin ──────────────────────────────────────────────────────────────────
+JELLYFIN_URL=http://jellyfin.local:8096
+JELLYFIN_API_KEY=your-jellyfin-api-key
+# JELLYFIN_USER_ID=  # optional; omit when using an admin API key
+
+# ── Radarr (optional) ─────────────────────────────────────────────────────────
+RADARR_URL=http://radarr.local:7878
+RADARR_API_KEY=your-radarr-api-key
+RADARR_ENABLED=false
+
+# ── Sonarr (optional) ─────────────────────────────────────────────────────────
+SONARR_URL=http://sonarr.local:8989
+SONARR_API_KEY=your-sonarr-api-key
+SONARR_ENABLED=false
+
+# ── Subtitle languages ────────────────────────────────────────────────────────
+# Comma-separated ISO 639-2 codes to keep. Forced and hearing-impaired tracks
+# are always kept regardless of this setting.
+SUBTITLE_LANGUAGES=eng,deu,spa
+
+# ── Media paths (optional) ────────────────────────────────────────────────────
+# Host-side paths for your media libraries. Used to generate Docker commands on
+# the review page. Jellyfin always exposes libraries at /movies and /series, so
+# these are the left-hand sides of the Docker volume mounts:
+#   -v /mnt/user/storage/Movies:/movies  →  MOVIES_PATH=/mnt/user/storage/Movies
+#   -v /mnt/user/storage/Series:/series  →  SERIES_PATH=/mnt/user/storage/Series
+#
+# MOVIES_PATH=/mnt/user/storage/Movies
+# SERIES_PATH=/mnt/user/storage/Series