Add OIDC logout, fix OpenAPI schema types, expose end_session_endpoint

Backend:
- Expose end_session_endpoint from OIDC provider metadata in /auth/oidc/config
- Add getEndSessionEndpoint() to OidcTokenExchanger

Frontend:
- On OIDC logout, redirect to provider's end_session_endpoint to clear SSO session
- Strip /api/v1 prefix from OpenAPI paths to match client baseUrl convention
- Add schema-types.ts with convenience type re-exports from generated schema
- Fix all type imports to use schema-types instead of raw generated schema
- Fix optional field access (processors, children, duration) with proper typing
- Fix AgentInstance.state → status field name

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ui/src/api/queries/executions.ts

@@ -1,6 +1,12 @@
 import { useQuery } from '@tanstack/react-query';
 import { api } from '../client';
-import type { SearchRequest } from '../schema';
+import type {
+  SearchRequest,
+  ExecutionStats,
+  ExecutionSummary,
+  StatsTimeseries,
+  ExecutionDetail,
+} from '../schema-types';
 
 export function useExecutionStats(timeFrom: string | undefined, timeTo: string | undefined) {
   return useQuery({
@@ -15,7 +21,7 @@ export function useExecutionStats(timeFrom: string | undefined, timeTo: string |
         },
       });
       if (error) throw new Error('Failed to load stats');
-      return data!;
+      return data as unknown as ExecutionStats;
     },
     enabled: !!timeFrom,
     placeholderData: (prev) => prev,
@@ -31,7 +37,7 @@ export function useSearchExecutions(filters: SearchRequest, live = false) {
         body: filters,
       });
       if (error) throw new Error('Search failed');
-      return data!;
+      return data as unknown as { data: ExecutionSummary[]; total: number; offset: number; limit: number };
     },
     placeholderData: (prev) => prev,
     refetchInterval: live ? 5_000 : false,
@@ -52,7 +58,7 @@ export function useStatsTimeseries(timeFrom: string | undefined, timeTo: string
         },
       });
       if (error) throw new Error('Failed to load timeseries');
-      return data!;
+      return data as unknown as StatsTimeseries;
     },
     enabled: !!timeFrom,
     placeholderData: (prev) => prev,
@@ -68,7 +74,7 @@ export function useExecutionDetail(executionId: string | null) {
         params: { path: { executionId: executionId! } },
       });
       if (error) throw new Error('Failed to load execution detail');
-      return data!;
+      return data as unknown as ExecutionDetail;
     },
     enabled: !!executionId,
   });
@@ -90,7 +96,7 @@ export function useProcessorSnapshot(
         },
       );
       if (error) throw new Error('Failed to load snapshot');
-      return data!;
+      return data as unknown as Record<string, string>;
     },
     enabled: !!executionId && index !== null,
   });