chore: add docker config and env template

.dockerignore

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+**/node_modules
+**/.nuxt
+**/.output
+**/.vitepress/dist
+**/.vitepress/cache
+**/dist
+**/.env
+**/.env.*
+!**/.env.example
+**/*.md
+!apps/docs/**/*.md
+.github/
+docker-compose*.yml

.env.example

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+REDIS_URL=redis://localhost:6379
+BROWSER_POOL_SIZE=5
+SESSION_TTL_SECONDS=3600
+PROXY_URL=
+RESIDENTIAL_PROXY_URL=
+PORT_API=8191
+PORT_WEB=3000
+PORT_DOCS=3001
+
+# --- reCAPTCHA v2 audio solving (optional) ---
+#
+# By default TRAWL uses Google's own free Speech API to transcribe reCAPTCHA
+# audio challenges — no key or signup needed. If you want to use a local
+# Whisper server instead (fully air-gapped), set STT_URL:
+#
+#   whisper.cpp server:         STT_URL=http://localhost:8080/inference
+#   faster-whisper-server:      STT_URL=http://localhost:8000/v1/audio/transcriptions
+STT_URL=
+STT_API_KEY=
+
+# Chrome executable path (overrides default /usr/bin/google-chrome inside Docker)
+CHROME_EXECUTABLE=
+
+# Optional: full path to the ffmpeg binary for reCAPTCHA audio transcoding.
+# Docker installs ffmpeg via apt so this isn't needed in production.
+# On macOS with Playwright's bundled binary (ffmpeg-mac), either set this or create a symlink:
+#   ln -sf ~/.cache/ms-playwright/ffmpeg-*/ffmpeg-mac ~/.local/bin/ffmpeg
+FFMPEG_PATH=