refactor: restore behavior the branch had changed (codex review)

A codex review of the branch found seven places where earlier refactor commits changed behavior. Each is restored here with a test:

- base_service imported flood_scope relatively; the local-service loader also runs that file as local_services.base_service, where the import cannot resolve. Now absolute.
- Radio-health fields were initialized after commands and services were built, so a plugin constructor reading is_radio_offline raised. They are now set before any plugin.
- Removing the per-command can_execute overrides made 31 commands honor skip_channel_check, which their overrides had dropped. BaseCommand.honors_skip_channel_check (False on exactly those commands) keeps them enforcing their channel list.
- CommandManager.get_plugin_metadata, WxCommand.get_weather_for_zipcode and PluginLoader.validate_plugin were public compatibility entry points; they are back.
- feed_manager stopped exporting DEFAULT_MAX_FEED_RESPONSE_BYTES and DEFAULT_MAX_PARSED_FEED_ITEMS despite the commit saying it re-exported them; it does now.
- wx and gwx logged companion-location lookup failures at WARNING; the shared helper logged at debug. It now takes the level.
- The INFO 'MESSAGE ROUTING' / 'DIRECT MESSAGE' lines for pubkey-correlated DMs were removed with the dead path_info computation; they are logged again by a log-only helper.

modules/location.py

@@ -628,8 +628,13 @@ def get_config_default_lat_lon(bot: Any, section: str) -> Optional[tuple[float,
     return None
 
 
-def get_companion_lat_lon(bot: Any, message: Any, logger: Any = None) -> Optional[tuple[float, float]]:
-    """The sender's most recent advertised position from contact tracking, or None."""
+def get_companion_lat_lon(
+    bot: Any, message: Any, logger: Any = None, error_level: str = "debug"
+) -> Optional[tuple[float, float]]:
+    """The sender's most recent advertised position from contact tracking, or None.
+
+    A lookup error is logged on ``logger`` at ``error_level`` and returns None.
+    """
     try:
         sender_pubkey = getattr(message, "sender_pubkey", None)
         if not sender_pubkey or not hasattr(bot, "db_manager"):
@@ -649,7 +654,7 @@ def get_companion_lat_lon(bot: Any, message: Any, logger: Any = None) -> Optiona
             return (float(row["latitude"]), float(row["longitude"]))
     except Exception as e:
         if logger is not None:
-            logger.debug(f"Error getting companion location: {e}")
+            getattr(logger, error_level)(f"Error getting companion location: {e}")
     return None