Add job processing system with streaming endpoint

Introduced a `processing` router to handle job streaming using server-sent events. Added `Jobs` and `JobStatus` models for managing job-related data, along with database creation logic. Updated the `sample` router to create new job entries during experiment creation.

backend/main.py

@@ -90,10 +90,14 @@ with open(config_file) as f:
 if environment in ["test", "dev"]:
     cert_path = config.get("ssl_cert_path", "ssl/cert.pem")
     key_path = config.get("ssl_key_path", "ssl/key.pem")
+    ssl_dir = Path(cert_path).parent
+
+    # Ensure the directory exists before file operations
+    ssl_dir.mkdir(parents=True, exist_ok=True)
+
 elif environment == "prod":
     cert_path = config.get("SSL_CERT_PATH")
     key_path = config.get("SSL_KEY_PATH")
-    # Validate production SSL paths
     if not cert_path or not key_path:
         raise ValueError(
             "SSL_CERT_PATH and SSL_KEY_PATH must be set in config_prod.json"
@@ -107,9 +111,8 @@ elif environment == "prod":
 else:
     raise ValueError(f"Unknown environment: {environment}")
 
-# Generate SSL Key and Certificate if not exist (only for development)
+# Generate SSL Key and Certificate if they do not exist
 if environment == "dev":
-    Path("ssl").mkdir(parents=True, exist_ok=True)
     if not Path(cert_path).exists() or not Path(key_path).exists():
         ssl_heidi.generate_self_signed_cert(cert_path, key_path)
 
@@ -235,7 +238,7 @@ if __name__ == "__main__":
     if is_ci or environment == "test":
         # Test or CI Mode: Run server process temporarily for test validation
         ssl_dir = Path(cert_path).parent
-        # ssl_dir.mkdir(parents=True, exist_ok=True)
+        ssl_dir.mkdir(parents=True, exist_ok=True)
 
         # Generate self-signed certs if missing
         if not Path(cert_path).exists() or not Path(key_path).exists():