style: convert remaining logger %-style calls to f-strings (#23)

Last 3 logger calls still using printf-style formatting; all other log
messages and inline string formatting already use f-strings. Template
constants in constants.py keep .format() since they are an i18n boundary.

Author: rezhajulio

src/bot/plugins/config.py

@@ -147,7 +147,7 @@ async def wrapper(
             effective_map: dict[int, dict[str, bool]] = context.bot_data.get("plugin_effective_map", {})
 
             if not is_plugin_enabled_for_group(effective_map, group_id, plugin_name):
-                logger.debug("Plugin '%s' disabled for group %d, skipping", plugin_name, group_id)
+                logger.debug(f"Plugin '{plugin_name}' disabled for group {group_id}, skipping")
                 return
 
             await callback(update, context, *args, **kwargs)

src/bot/plugins/manager.py

@@ -150,7 +150,10 @@ def register_all(
             handlers = registrar(application)
             result[name] = handlers
             noun = "job(s)" if name.endswith("_job") else "handler(s)"
-            logger.info("Registered plugin: %s (group=%d, %d %s)", name, defs_by_name[name]["handler_group"], len(handlers), noun)  # type: ignore[arg-type]
+            group = defs_by_name[name]["handler_group"]
+            logger.info(
+                f"Registered plugin: {name} (group={group}, {len(handlers)} {noun})"
+            )
 
         # Store metadata for later gating
         metadata: dict[str, dict] = {}
@@ -188,5 +191,5 @@ def compute_effective_map(
         plugins_default = getattr(settings, "plugins_default", {})
         effective_map = compute_effective_plugin_map(plugins_default, registry)
         application.bot_data["plugin_effective_map"] = effective_map  # type: ignore[index]
-        logger.info("Computed effective plugin map for %d group(s)", len(effective_map))
+        logger.info(f"Computed effective plugin map for {len(effective_map)} group(s)")
         return effective_map