Add Seismo Fleet Manager backend v0.1

Implemented FastAPI backend with SQLite database for tracking seismograph fleet status:
- database.py: SQLAlchemy setup with SQLite
- models.py: Emitter model with id, unit_type, last_seen, last_file, status, notes
- routes.py: POST /emitters/report and GET /fleet/status endpoints
- main.py: FastAPI app initialization with CORS support
- requirements.txt: Dependencies (FastAPI, SQLAlchemy, uvicorn)

main.py

@@ -0,0 +1,41 @@
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+
+from database import engine, Base
+from routes import router
+
+# Create database tables
+Base.metadata.create_all(bind=engine)
+
+# Initialize FastAPI app
+app = FastAPI(
+    title="Seismo Fleet Manager",
+    description="Backend API for managing seismograph fleet status",
+    version="0.1.0"
+)
+
+# Configure CORS (adjust origins as needed for your deployment)
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],  # In production, specify exact origins
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+# Include API routes
+app.include_router(router)
+
+
+@app.get("/")
+def root():
+    """Root endpoint - health check"""
+    return {
+        "message": "Seismo Fleet Manager API v0.1",
+        "status": "running"
+    }
+
+
+if __name__ == "__main__":
+    import uvicorn
+    uvicorn.run(app, host="0.0.0.0", port=8000)