feat(BA-5829): add AppConfigFragment + AppConfig GQL surface

Adds the GraphQL exposure for AppConfigFragment and the merged
AppConfig view (BEP-1052 §2 / §5).

Service / processor additions (only what the GQL layer needs that is
not already in BA-5827):
- Merged-view actions: get_user_app_config, search_user_app_configs,
  admin_search_app_configs (single-row + paginated reads of the
  computed AppConfig view).
- Service methods + processor wiring + supported_actions for those
  three actions.

Adapter additions:
- Merged-view methods: get_user_app_config / my_app_configs /
  admin_search_app_configs / public_app_config_fragments. `my_*`
  pulls the user from current_user() inside the adapter.
- Bulk-only `my` mutations: my_bulk_create / my_bulk_update —
  bulk admin variants are wired in BA-5827 already.

DTO additions:
- common/dto/manager/v2/app_config/* — AppConfigNode,
  GetUserAppConfigInput / Payload, SearchAppConfigsInput / Payload,
  SearchMyAppConfigsInput, BulkCreate/UpdateMyAppConfigFragmentsPayload
  (the my-bulk payloads live here because they carry AppConfigNode).

GraphQL:
- app_config package: AppConfigGQL, my/admin/public root resolvers.
- app_config_fragment package: scope-bound + admin queries, bulk-only
  mutations (admin + my variants), AppConfigFragmentGQL +
  AppConfigScopeTypeGQL + filter/order/key inputs.
- DataLoader: app_config_fragment_loader for N+1 batching.
- schema.py: register the new root queries / mutations.

Resolves BA-5829.

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

Author: jopemachine

src/ai/backend/common/dto/manager/v2/app_config/__init__.py

@@ -1,5 +1,5 @@
 """
-AppConfig (merged view) DTOs v2 for Manager API.
+AppConfig (merged view) DTOs v2 for Manager API (BEP-1052 §5).
 """
 
 from .request import (
@@ -11,9 +11,9 @@
 )
 from .response import (
     AppConfigNode,
+    BulkCreateMyAppConfigFragmentsPayload,
+    BulkUpdateMyAppConfigFragmentsPayload,
     GetUserAppConfigPayload,
-    MyBulkCreateAppConfigFragmentsPayload,
-    MyBulkUpdateAppConfigFragmentsPayload,
     SearchAppConfigsPayload,
 )
 from .types import (
@@ -28,8 +28,8 @@
     "AppConfigOrder",
     "AppConfigOrderField",
     "AppConfigScopeType",
-    "MyBulkCreateAppConfigFragmentsPayload",
-    "MyBulkUpdateAppConfigFragmentsPayload",
+    "BulkCreateMyAppConfigFragmentsPayload",
+    "BulkUpdateMyAppConfigFragmentsPayload",
     "GetUserAppConfigInput",
     "GetUserAppConfigPayload",
     "OrderDirection",

src/ai/backend/common/dto/manager/v2/app_config/request.py

@@ -1,5 +1,5 @@
 """
-Request DTOs for AppConfig (merged view) DTO v2.
+Request DTOs for AppConfig (merged view) DTO v2 (BEP-1052 §5).
 """
 
 from __future__ import annotations
@@ -9,7 +9,7 @@
 from pydantic import Field
 
 from ai.backend.common.api_handlers import BaseRequestModel
-from ai.backend.common.dto.manager.query import DateTimeFilter, StringFilter, UUIDFilter
+from ai.backend.common.dto.manager.query import StringFilter, UUIDFilter
 
 from .types import AppConfigOrderField, OrderDirection
 
@@ -31,27 +31,13 @@ class GetUserAppConfigInput(BaseRequestModel):
 
 
 class AppConfigFilter(BaseRequestModel):
-    """Filter for AppConfig merged-view search.
-
-    `created_at` / `updated_at` filter against the **oldest** /
-    **latest** timestamp across the contributing fragments — the
-    natural projection of "when was this config first created" and
-    "when was it last touched".
-    """
+    """Filter for AppConfig merged-view search."""
 
     name: StringFilter | None = Field(default=None, description="Filter by policy name.")
     user_id: UUIDFilter | None = Field(
         default=None,
         description="Filter by target user id (admin cross-user search only).",
     )
-    created_at: DateTimeFilter | None = Field(
-        default=None,
-        description=("Filter by the oldest contributing fragment's creation timestamp."),
-    )
-    updated_at: DateTimeFilter | None = Field(
-        default=None,
-        description=("Filter by the latest contributing fragment's update timestamp."),
-    )
 
 
 class AppConfigOrder(BaseRequestModel):
@@ -76,7 +62,7 @@ class SearchMyAppConfigsInput(_AppConfigSearchInputBase):
     """Input for self-service merged-view search (`/v2/app-configs/my/search`).
 
     The adapter pins the caller as the user scope; no `user_id` argument
-    is accepted here.
+    is accepted here (BEP-1052 §5 — `filter.userId` is ignored).
     """
 
 

src/ai/backend/common/dto/manager/v2/app_config/response.py

@@ -1,5 +1,5 @@
 """
-Response DTOs for AppConfig (merged view) DTO v2.
+Response DTOs for AppConfig (merged view) DTO v2 (BEP-1052 §5).
 """
 
 from __future__ import annotations
@@ -17,15 +17,15 @@
 
 __all__ = (
     "AppConfigNode",
-    "MyBulkCreateAppConfigFragmentsPayload",
-    "MyBulkUpdateAppConfigFragmentsPayload",
+    "BulkCreateMyAppConfigFragmentsPayload",
+    "BulkUpdateMyAppConfigFragmentsPayload",
     "GetUserAppConfigPayload",
     "SearchAppConfigsPayload",
 )
 
 
 class AppConfigNode(BaseResponseModel):
-    """Merged per-user AppConfig view.
+    """Merged per-user AppConfig view (BEP-1052 §5).
 
     `fragments` are ordered low → high merge priority (matching the
     policy's `scope_sources`). `config` is the deep-merged result,
@@ -62,11 +62,11 @@ class SearchAppConfigsPayload(BaseResponseModel):
     has_previous_page: bool = Field(default=False, description="Whether there is a previous page.")
 
 
-class MyBulkCreateAppConfigFragmentsPayload(BaseResponseModel):
+class BulkCreateMyAppConfigFragmentsPayload(BaseResponseModel):
     """Payload for `bulkCreateMyAppConfigFragments`.
 
     Each successfully created row produces a recomputed merged
-    `AppConfigNode`; failures are collected per-item.
+    `AppConfigNode`; failures are collected per-item (BEP-1052 §3).
     """
 
     created: list[AppConfigNode] = Field(
@@ -75,7 +75,7 @@ class MyBulkCreateAppConfigFragmentsPayload(BaseResponseModel):
     failed: list[AppConfigFragmentBulkError] = Field(description="Per-item failures.")
 
 
-class MyBulkUpdateAppConfigFragmentsPayload(BaseResponseModel):
+class BulkUpdateMyAppConfigFragmentsPayload(BaseResponseModel):
     """Payload for `bulkUpdateMyAppConfigFragments`."""
 
     updated: list[AppConfigNode] = Field(

src/ai/backend/common/dto/manager/v2/app_config/types.py

@@ -1,5 +1,5 @@
 """
-Common types for AppConfig (merged view) DTO v2.
+Common types for AppConfig (merged view) DTO v2 (BEP-1052 §5).
 """
 
 from __future__ import annotations
@@ -21,5 +21,3 @@ class AppConfigOrderField(StrEnum):
 
     USER_ID = "user_id"
     NAME = "name"
-    CREATED_AT = "created_at"
-    UPDATED_AT = "updated_at"