Add api server code and workflow

src/core/__init__.py

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+# This file is intentionally left blank.

src/core/config.py

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+import os
+from dotenv import load_dotenv
+
+load_dotenv()
+
+class Config:
+    PROJECT_NAME = "Flexible Employment Analysis API"
+    API_V1_STR = "/api/v1"
+    SECRET_KEY = os.getenv("SECRET_KEY", "your-secret-key")
+    DATABASE_URL = os.getenv("DATABASE_URL", "sqlite:///./test.db")
+    DEBUG = os.getenv("DEBUG", "false").lower() in ("true", "1", "t")