Initial MVP skeleton with auth, chat persistence, UI and text LLM integration

.env.example

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+APP_ENV=dev
+
+POSTGRES_DB=ai_chat
+POSTGRES_USER=ai_chat
+POSTGRES_PASSWORD=change_me_now
+
+ADMIN_BOOTSTRAP_LOGIN=admin
+ADMIN_BOOTSTRAP_PASSWORD=change_me_later
+
+NEXT_PUBLIC_API_BASE_URL=http://127.0.0.1:18000
+
+SESSION_SECRET=change_me_long_random_secret
+SESSION_COOKIE_NAME=ai_chat_session
+SESSION_COOKIE_SECURE=false
+SESSION_COOKIE_SAMESITE=lax
+SESSION_TTL_HOURS=168
+
+LLM_MANAGER_BASE_URL=http://192.168.149.194:8001
+LLM_MANAGER_API_KEY=change_me
+SEARXNG_BASE_URL=http://192.168.149.22:8888
+
+UPLOAD_ROOT=/data/uploads
+TEMP_ROOT=/data/temp
+LOG_ROOT=/data/logs
+
+MAX_IMAGE_MB=10
+MAX_AUDIO_MB=25
+MAX_AUDIO_DURATION_SEC=300
+MAX_MESSAGE_CHARS=16000
+
+TTS_TTL_HOURS=4
+TEMP_AUDIO_TTL_HOURS=24
+ORPHAN_FILE_GRACE_HOURS=24
+
+SUMMARY_TRIGGER_MESSAGE_COUNT=30
+SUMMARY_KEEP_RECENT_MESSAGES=16
+SUMMARY_MAX_CHARS=8000
+SUMMARY_MODEL_ALIAS=qwen3.5-4b