@mytec: feat: Phase 3.0 Architecture Refactor ✅

Major refactoring of RFCP backend:
- Modular propagation models (8 models)
- SharedMemoryManager for terrain data
- ProcessPoolExecutor parallel processing
- WebSocket progress streaming
- Building filtering pipeline (351k → 15k)
- 82 unit tests

Performance: Standard preset 38s → 5s (7.6x speedup)

Known issue: Detailed preset timeout (fix in 3.1.0)

backend/app/main.py

@@ -1,10 +1,11 @@
 from contextlib import asynccontextmanager
 
-from fastapi import FastAPI
+from fastapi import FastAPI, WebSocket
 from fastapi.middleware.cors import CORSMiddleware
 
 from app.core.database import connect_to_mongo, close_mongo_connection
 from app.api.routes import health, projects, terrain, coverage, regions, system
+from app.api.websocket import websocket_endpoint
 
 
 @asynccontextmanager
@@ -17,7 +18,7 @@ async def lifespan(app: FastAPI):
 app = FastAPI(
     title="RFCP Backend API",
     description="RF Coverage Planning Backend",
-    version="1.6.0",
+    version="3.0.0",
     lifespan=lifespan,
 )
 
@@ -30,7 +31,7 @@ app.add_middleware(
     allow_headers=["*"],
 )
 
-# Routes
+# REST routes
 app.include_router(health.router, prefix="/api/health", tags=["health"])
 app.include_router(projects.router, prefix="/api/projects", tags=["projects"])
 app.include_router(terrain.router, prefix="/api/terrain", tags=["terrain"])
@@ -38,10 +39,13 @@ app.include_router(coverage.router, prefix="/api/coverage", tags=["coverage"])
 app.include_router(regions.router, prefix="/api/regions", tags=["regions"])
 app.include_router(system.router, prefix="/api/system", tags=["system"])
 
+# WebSocket endpoint for real-time coverage with progress
+app.websocket("/ws")(websocket_endpoint)
+
 
 @app.get("/")
 async def root():
-    return {"message": "RFCP Backend API", "version": "1.5.1"}
+    return {"message": "RFCP Backend API", "version": "3.0.0"}
 
 
 if __name__ == "__main__":