refactor(BA-5832): rename extra_config -> config in CLI / SDK and stale GQL leftovers

The CLI helptext (`bulk-create` / `bulk-update`) and a few GQL type
fields still referenced `extra_config`; align them with the column
rename. Also refresh the schema dump for the residual `extraConfig`
fields.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: jopemachine

src/ai/backend/client/cli/v2/admin/app_config_fragment.py

@@ -99,7 +99,7 @@ async def _run() -> None:
     "--items",
     required=True,
     help=(
-        "JSON list of `{key: {scope_type, scope_id, name}, extra_config}` items, "
+        "JSON list of `{key: {scope_type, scope_id, name}, config}` items, "
         "or `@path/to/items.json`."
     ),
 )
@@ -129,7 +129,7 @@ async def _run() -> None:
 @click.option(
     "--items",
     required=True,
-    help="Same shape as `bulk-create`; replaces `extra_config` wholesale.",
+    help="Same shape as `bulk-create`; replaces `config` wholesale.",
 )
 def bulk_update(items: str) -> None:
     """Bulk-update fragments (partial-success semantics)."""

src/ai/backend/client/cli/v2/my/app_config.py

@@ -83,7 +83,7 @@ def _load_items(items_arg: str) -> list[dict[str, Any]]:
 @click.option(
     "--items",
     required=True,
-    help="JSON list of `{name, extra_config}` items, or `@path/to/items.json`.",
+    help="JSON list of `{name, config}` items, or `@path/to/items.json`.",
 )
 def bulk_create(items: str) -> None:
     """Bulk-create USER-scope fragments; returns recomputed merged views."""
@@ -111,7 +111,7 @@ async def _run() -> None:
 @click.option(
     "--items",
     required=True,
-    help="Same shape as `bulk-create`; replaces `extra_config` wholesale.",
+    help="Same shape as `bulk-create`; replaces `config` wholesale.",
 )
 def bulk_update(items: str) -> None:
     """Bulk-update USER-scope fragments; returns recomputed merged views."""