Add OH_LLM_MODEL_KIND env var to enable DB-backed verified models

Wires up the SaaS verified-models DI injector so the OpenHands app reads
its verified model list from the database (maintained via the admin API)
instead of falling back to the hardcoded list shipped in openhands-sdk.

Before OpenHands/OpenHands#14237, enterprise/saas_server.py called
override_llm_models_dependency() unconditionally. That PR replaced the
mechanism with a generic LLMModelServiceInjector whose default is
DefaultLLMModelService (hardcoded). The SaaS variant
(SaaSLLMModelServiceInjector) is now only registered when
OH_LLM_MODEL_KIND points at it. Production was therefore silently
serving the hardcoded model list and admin-API changes did not show up
in app.all-hands.dev.

Mirrors the pattern already used for OH_APP_CONVERSATION_INFO_KIND.

Fixes #677

Co-authored-by: openhands <openhands@all-hands.dev>

Author: openhands-agent

charts/openhands/Chart.yaml

@@ -2,7 +2,7 @@ apiVersion: v2
 description: OpenHands is an AI-driven autonomous software engineer
 name: openhands
 appVersion: cloud-1.34.0
-version: 0.7.34
+version: 0.7.35
 maintainers:
   - name: rbren
   - name: xingyao

charts/openhands/templates/_env.yaml

@@ -529,6 +529,8 @@
   value: "saas"
 - name: OH_APP_CONVERSATION_INFO_KIND
   value: server.utils.saas_app_conversation_info_injector.SaasAppConversationInfoServiceInjector
+- name: OH_LLM_MODEL_KIND
+  value: server.verified_models.verified_model_router.SaaSLLMModelServiceInjector
 - name: CONVERSATION_MANAGER_CLASS
   value: server.saas_nested_conversation_manager.SaasNestedConversationManager
 {{- if (index .Values "plugin-directory").enabled }}