Add Docker packaging for the TypeScript app

.env.example

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+# Required
+JELLYFIN_URL=
+JELLYFIN_API_KEY=
+JELLYFIN_USER_ID=
+TMDB_API_KEY=
+
+# LLM (disabled by default — works with Ollama, OpenAI, LM Studio, etc.)
+LLM_ENABLED=false
+LLM_BASE_URL=http://localhost:11434/v1
+LLM_API_KEY=
+LLM_MODEL=llama3
+
+# Radarr (disabled by default)
+RADARR_ENABLED=false
+RADARR_URL=
+RADARR_API_KEY=
+RADARR_QUALITY_PROFILE_ID=1
+RADARR_ROOT_FOLDER=/movies
+
+# Cron auto-run (disabled by default)
+CRON_ENABLED=false
+CRON_SCHEDULE=0 3 * * *
+
+# HTTP API (enabled by default)
+API_ENABLED=true
+API_PORT=8080
+SECRET_KEY=
+
+# Tuning
+RECOMMEND_COUNT=10
+RECOMMEND_MAX_RETRY=3
+MIN_RATED_MOVIES=5
+
+# Langfuse (required by the TypeScript app)
+LANGFUSE_PUBLIC_KEY=
+LANGFUSE_SECRET_KEY=
+LANGFUSE_BASE_URL=
+LANGFUSE_PROMPT_CACHE_ENABLED=true