fix(server): index & gc queue & llm compatibility (#15528)

fix #15523
fix #15526

#### PR Dependency Tree


* **PR #15528** 👈

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

- **Bug Fixes**
- Improved search generation cleanup, provider error reporting, and
reconciliation reliability.
- Retired search resources are cleaned up safely, including after
credential changes.
- Prompt size checks now ignore tool parameters and provide clearer
errors.
- Reserved documents are protected from accidental cleanup, and
malformed identifiers are rejected.

- **Configuration**
- Managed Copilot profiles require explicit, non-duplicated model
assignments.
  - Improved managed provider profile migration.

- **Performance & Reliability**
- Reduced unnecessary search-history cleanup and adjusted
consistency-check intervals.
- Failed reconciliation jobs stop after one attempt and are removed
automatically.

- **Data Updates**
  - Updated legacy AI session prompt names to current labels.
  - Improved cloud load-balancer health-check configuration.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

.github/helm/affine/charts/front/templates/service-sync.yaml

@@ -4,8 +4,10 @@ metadata:
   name: {{ .Values.services.sync.name }}
   labels:
     {{- include "front.labels" . | nindent 4 }}
-  {{- with .Values.services.sync.annotations }}
+  {{- $annotations := omit .Values.services.sync.annotations "cloud.google.com/backend-config" }}
   annotations:
+    cloud.google.com/backend-config: {{ dict "default" .Values.services.sync.backendConfig.name | toJson | quote }}
+  {{- with $annotations }}
     {{- toYaml . | nindent 4 }}
   {{- end }}
 spec:

.github/helm/affine/charts/front/values.yaml

@@ -52,8 +52,10 @@ services:
     name: affine-sync
     type: ClusterIP
     port: 3010
-    annotations:
-      cloud.google.com/backend-config: '{"default": "affine-api-backendconfig"}'
+    backendConfig:
+      name: affine-sync-backendconfig
+      timeoutSec: 10800
+    annotations: {}
   renderer:
     name: affine-renderer
     type: ClusterIP

.github/helm/affine/templates/backend-config.yaml

@@ -0,0 +1,32 @@
+{{- if eq .Values.global.deployment.platform "gcp" }}
+apiVersion: cloud.google.com/v1
+kind: BackendConfig
+metadata:
+  name: affine-api-backendconfig
+  annotations:
+    meta.helm.sh/release-name: {{ .Release.Name }}
+    meta.helm.sh/release-namespace: {{ .Release.Namespace }}
+  labels:
+    {{- include "affine.labels" . | nindent 4 }}
+spec:
+  healthCheck:
+    timeoutSec: 1
+    type: HTTP
+    requestPath: /info
+---
+apiVersion: cloud.google.com/v1
+kind: BackendConfig
+metadata:
+  name: {{ .Values.front.services.sync.backendConfig.name }}
+  annotations:
+    meta.helm.sh/release-name: {{ .Release.Name }}
+    meta.helm.sh/release-namespace: {{ .Release.Namespace }}
+  labels:
+    {{- include "affine.labels" . | nindent 4 }}
+spec:
+  timeoutSec: {{ .Values.front.services.sync.backendConfig.timeoutSec }}
+  healthCheck:
+    timeoutSec: 1
+    type: HTTP
+    requestPath: /info
+{{- end }}

.github/helm/affine/values.yaml

@@ -52,8 +52,10 @@ front:
       name: affine-sync
       type: ClusterIP
       port: 3010
-      annotations:
-        cloud.google.com/backend-config: '{"default": "affine-api-backendconfig"}'
+      backendConfig:
+        name: affine-sync-backendconfig
+        timeoutSec: 10800
+      annotations: {}
     renderer:
       name: affine-renderer
       type: ClusterIP

.github/helm/separate-config/backend-config.yaml

@@ -1,10 +0,0 @@
-apiVersion: cloud.google.com/v1
-kind: BackendConfig
-metadata:
-  name: "affine-api-backendconfig"
-spec:
-  healthCheck:
-    timeoutSec: 1
-    type: HTTP
-    requestPath: /info
-