Initial commit: SIEM Toolkit for SentinelOne

Dockerized SecOps toolkit with:
- Coverage Map: STAR rule vs SDL parser field coverage analysis
- Ingest Dashboard: PowerQuery-powered event volume and source breakdown
- Onboarding Assistant: AI-guided log source onboarding with Claude
- Parser management via SDL MCP integration

Stack: FastAPI + PostgreSQL backend, nginx-served HTML frontend, Docker Compose.
PowerQuery runs via Scalyr XDR API (SDL_XDR_URL + SDL_LOG_READ_KEY).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/main.py

@@ -0,0 +1,24 @@
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+from db import engine, Base
+from routers import coverage, ingest
+
+Base.metadata.create_all(bind=engine)
+
+app = FastAPI(title="SIEM Toolkit", version="1.0.0")
+
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["http://localhost:3001"],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+app.include_router(coverage.router, prefix="/api/coverage", tags=["Coverage"])
+app.include_router(ingest.router, prefix="/api/ingest", tags=["Ingest"])
+
+
+@app.get("/health")
+def health():
+    return {"status": "ok"}