refactor: remove config_source flag from bootstrap settings

Database config is now the only option, no need for feature flag.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/central/bootstrap_config.py

@@ -1,61 +1,46 @@
-"""Bootstrap configuration from environment variables.
-
-This module provides early-stage configuration loading from environment
-variables or a .env file. Used before the database-backed config store
-is available.
-"""
-
-from functools import lru_cache
-from pathlib import Path
-from typing import Literal
-
-from pydantic import Field, field_validator
-from pydantic_settings import BaseSettings, SettingsConfigDict
-
-
-class Settings(BaseSettings):
-    """Bootstrap settings loaded from environment or .env file."""
-
-    model_config = SettingsConfigDict(
-        env_prefix="CENTRAL_",
-        env_file=".env",
-        env_file_encoding="utf-8",
-        extra="ignore",
-    )
-
-    db_dsn: str = Field(description="PostgreSQL connection string")
-    nats_url: str = Field(default="nats://localhost:4222", description="NATS server URL")
-    master_key_path: Path = Field(
-        default=Path("/etc/central/master.key"),
-        description="Path to AES-256 master key file",
-    )
-    log_level: Literal["DEBUG", "INFO", "WARNING", "ERROR"] = Field(
-        default="INFO",
-        description="Logging level",
-    )
-    config_source: Literal["toml", "db"] = Field(
-        default="toml",
-        description="Configuration source: 'toml' for TOML file, 'db' for database",
-    )
-    config_toml_path: Path = Field(
-        default=Path("/etc/central/central.toml"),
-        description="Path to TOML config file (when config_source=toml)",
-    )
-
-    @field_validator("config_source")
-    @classmethod
-    def validate_config_source(cls, v: str) -> str:
-        if v not in ("toml", "db"):
-            raise ValueError(f"config_source must be 'toml' or 'db', got {v!r}")
-        return v
-
-
-@lru_cache
-def get_settings(env_file: Path | None = None) -> Settings:
-    """Load settings, optionally from a specific .env file.
-
-    Results are cached. Call get_settings.cache_clear() to reload.
-    """
-    if env_file is not None:
-        return Settings(_env_file=env_file)
-    return Settings()
+"""Bootstrap configuration from environment variables.
+
+This module provides early-stage configuration loading from environment
+variables or a .env file. Used before the database-backed config store
+is available.
+"""
+
+from functools import lru_cache
+from pathlib import Path
+from typing import Literal
+
+from pydantic import Field
+from pydantic_settings import BaseSettings, SettingsConfigDict
+
+
+class Settings(BaseSettings):
+    """Bootstrap settings loaded from environment or .env file."""
+
+    model_config = SettingsConfigDict(
+        env_prefix="CENTRAL_",
+        env_file=".env",
+        env_file_encoding="utf-8",
+        extra="ignore",
+    )
+
+    db_dsn: str = Field(description="PostgreSQL connection string")
+    nats_url: str = Field(default="nats://localhost:4222", description="NATS server URL")
+    master_key_path: Path = Field(
+        default=Path("/etc/central/master.key"),
+        description="Path to AES-256 master key file",
+    )
+    log_level: Literal["DEBUG", "INFO", "WARNING", "ERROR"] = Field(
+        default="INFO",
+        description="Logging level",
+    )
+
+
+@lru_cache
+def get_settings(env_file: Path | None = None) -> Settings:
+    """Load settings, optionally from a specific .env file.
+
+    Results are cached. Call get_settings.cache_clear() to reload.
+    """
+    if env_file is not None:
+        return Settings(_env_file=env_file)
+    return Settings()