docs(fastapi): resolve base_path from the bootstrap file, not cwd (#61)

Path.cwd() depends on the execution directory; use
Path(__file__).resolve().parent.parent to derive the project root from the
bootstrap file location, matching the application starter template.

Author: tmgbedu

docs/fastapi.md

@@ -33,7 +33,7 @@ from providers.fastapi_provider import FastAPIProvider
 from config.fastapi import FastAPIConfig
 
 app: Application = Application(
-    base_path=str(Path.cwd()),  # This always gives path relative to the execution.
+    base_path=Path(__file__).resolve().parent.parent,
     providers=[
         LogProvider,
         (FastAPIProvider, FastAPIConfig),