Switch to PyMongo, update config and requirements, fix FTP extension

typo

- Replace Motor (async) with PyMongo (sync) in database manager - Update
environment variable names for FTP and MongoDB config - Remove unused
dependencies from requirements.txt - Fix file extension typo: .slg_v2 →
.sgl_v2 throughout code and docs - Add debug prints for MongoDB env vars
in config - Update FTP monitor to use correct file extension and PyMongo
- Adjust FastAPI descriptions for new extension

microservices/data-ingestion-service/src/main.py

@@ -1,6 +1,6 @@
 """
 SA4CPS Data Ingestion Service
-Simple FTP monitoring service for .slg_v2 files with MongoDB storage
+Simple FTP monitoring service for .sgl_v2 files with MongoDB storage
 """
 
 from fastapi import FastAPI, HTTPException
@@ -53,7 +53,7 @@ async def lifespan(app: FastAPI):
 # Create FastAPI app
 app = FastAPI(
     title="SA4CPS Data Ingestion Service",
-    description="Monitors FTP server for .slg_v2 files and stores data in MongoDB",
+    description="Monitors FTP server for .sgl_v2 files and stores data in MongoDB",
     version="1.0.0",
     lifespan=lifespan
 )