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

backend/app/core/config.py

@@ -0,0 +1,39 @@
+from pydantic_settings import BaseSettings, SettingsConfigDict
+
+
+class Settings(BaseSettings):
+    model_config = SettingsConfigDict(extra="ignore")
+
+    app_env: str = "dev"
+    app_host: str = "0.0.0.0"
+    app_port: int = 8000
+
+    database_url: str
+
+    admin_bootstrap_login: str = "admin"
+    admin_bootstrap_password: str = "change_me_later"
+
+    llm_manager_base_url: str
+    llm_manager_api_key: str
+    searxng_base_url: str
+
+    upload_root: str = "/data/uploads"
+    temp_root: str = "/data/temp"
+    log_root: str = "/data/logs"
+
+    max_image_mb: int = 10
+    max_audio_mb: int = 25
+    max_audio_duration_sec: int = 300
+    max_message_chars: int = 16000
+
+    tts_ttl_hours: int = 4
+    temp_audio_ttl_hours: int = 24
+    orphan_file_grace_hours: int = 24
+
+    summary_trigger_message_count: int = 30
+    summary_keep_recent_messages: int = 16
+    summary_max_chars: int = 8000
+    summary_model_alias: str = "qwen3.5-4b"
+
+
+settings = Settings()