Implement Phase 4: tools, God Mode, and missing features

Backend:
- Add Tavily web search tool wrapper (tools/web_search.py)
- Add PDF reader + ChromaDB vector store tool (tools/pdf_reader.py)
- Bind tools to LLM calls via .bind_tools() in dynamic_graph_builder
- Implement God Mode using LangGraph interrupt_before + MemorySaver
- Add approve/reject/modify API endpoints for God Mode
- Add PDF upload endpoint with ingestion pipeline
- Add persistent run history (CouncilRun model + run_service + API)
- Add Alembic migration for council_runs table
- Enhance WebSocket to emit run_paused and run_resumed events
- Add tests for tools, God Mode, and run history

Frontend:
- Add God Mode approval UI (GodModePanel component)
- Add Auto-Pilot / God Mode toggle in Konferenzzimmer
- Add functional PDF upload handler
- Add Conditional Edge editor (EdgeSettingsPanel component)
- Add edge click selection in ArchitectCanvas
- Update Zustand store with edge selection and update actions
- Update types for God Mode, execution modes, and WS events
- Update API client with God Mode, PDF upload, and blueprint run endpoints
- Update WebSocket hook for paused/resumed events
- Add Vitest config and frontend tests (store, parser, types, API)

https://claude.ai/code/session_017U6idFgaqnYTXzPxA7mxMv

frontend/app/__tests__/api-client.test.ts

@@ -0,0 +1,34 @@
+import { describe, it, expect } from "vitest";
+import { wsUrl } from "@/app/utils/api-client";
+
+describe("wsUrl", () => {
+  it("should convert http to ws", () => {
+    const url = wsUrl("test-run-id");
+    expect(url).toBe("ws://localhost:8000/ws/council/test-run-id");
+  });
+});
+
+describe("API client types", () => {
+  it("should export runApi with expected methods", async () => {
+    const { runApi } = await import("@/app/utils/api-client");
+    expect(runApi.start).toBeDefined();
+    expect(runApi.startFromBlueprint).toBeDefined();
+    expect(runApi.status).toBeDefined();
+    expect(runApi.approve).toBeDefined();
+    expect(runApi.getState).toBeDefined();
+  });
+
+  it("should export councilApi with expected methods", async () => {
+    const { councilApi } = await import("@/app/utils/api-client");
+    expect(councilApi.list).toBeDefined();
+    expect(councilApi.get).toBeDefined();
+    expect(councilApi.create).toBeDefined();
+    expect(councilApi.update).toBeDefined();
+    expect(councilApi.delete).toBeDefined();
+  });
+
+  it("should export pdfApi with upload method", async () => {
+    const { pdfApi } = await import("@/app/utils/api-client");
+    expect(pdfApi.upload).toBeDefined();
+  });
+});