feat: Implement Milvus retriver for RAG (#516)

* feat: Implement MilvusRetriever with embedding model and resource management

* chore: Update configuration and loader files for consistency

* chore: Clean up test_milvus.py for improved readability and organization

* feat: Add tests for DashscopeEmbeddings query and document embedding methods

* feat: Add tests for embedding model initialization and example file loading in MilvusProvider

* chore: Remove unused imports and clean up test_milvus.py for better readability

* chore: Clean up test_milvus.py for improved readability and organization

* chore: Clean up test_milvus.py for improved readability and organization

* fix: replace print statements with logging in recursion limit function

* Implement feature X to enhance user experience and optimize performance

* refactor: clean up unused imports and comments in AboutTab component

* Implement feature X to enhance user experience and fix bug Y in module Z

---------

Co-authored-by: Willem Jiang <willem.jiang@gmail.com>

src/config/loader.py

@@ -7,6 +7,29 @@ from typing import Any, Dict
 import yaml
 
 
+def get_bool_env(name: str, default: bool = False) -> bool:
+    val = os.getenv(name)
+    if val is None:
+        return default
+    return str(val).strip().lower() in {"1", "true", "yes", "y", "on"}
+
+
+def get_str_env(name: str, default: str = "") -> str:
+    val = os.getenv(name)
+    return default if val is None else str(val).strip()
+
+
+def get_int_env(name: str, default: int = 0) -> int:
+    val = os.getenv(name)
+    if val is None:
+        return default
+    try:
+        return int(val.strip())
+    except ValueError:
+        print(f"Invalid integer value for {name}: {val}. Using default {default}.")
+        return default
+
+
 def replace_env_vars(value: str) -> str:
     """Replace environment variables in string values."""
     if not isinstance(value, str):