fix(api): use Configuration.get_config() in /config endpoint

Previously the GET /config endpoint read the config file directly,
bypassing the Configuration abstraction. This meant any override of
config loading in subclasses or alternate config modules was ignored,
causing the endpoint to always return the on-disk YAML regardless of
the active config source.

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

Author: pavanputhra

server/api.py

@@ -954,7 +954,7 @@ async def get_vcon_count(
 async def get_config() -> JSONResponse:
     """Get the current system configuration.
 
-    Reads and returns the configuration from the file specified in CONSERVER_CONFIG_FILE.
+    Returns the current configuration via Configuration.get_config().
 
     Returns:
         JSONResponse containing the configuration
@@ -963,8 +963,7 @@ async def get_config() -> JSONResponse:
         HTTPException: If there is an error reading the config file
     """
     try:
-        with open(os.getenv("CONSERVER_CONFIG_FILE"), "r") as f:
-            config = yaml.safe_load(f)
+        config = Configuration.get_config()
         return JSONResponse(content=config)
     except Exception as e:
         logger.error(f"Error reading config: {str(e)}")