add the code

config.py

@@ -0,0 +1,45 @@
+import os
+
+
+class Settings:
+    APP_NAME = "Chat7 CodeX Backend"
+    APP_VERSION = "1.0.0"
+
+    PRIMARY_CODE_MODEL = os.getenv("PRIMARY_CODE_MODEL", "Qwen/Qwen2.5-Coder-7B-Instruct")
+    FALLBACK_CODE_MODEL = os.getenv("FALLBACK_CODE_MODEL", "deepseek-ai/deepseek-coder-6.7b-instruct")
+
+    GITHUB_TOKEN = os.getenv("GITHUB_TOKEN", "")
+    STACKOVERFLOW_KEY = os.getenv("STACKOVERFLOW_KEY", "")
+
+    MODEL_TIMEOUT_SECONDS = int(os.getenv("MODEL_TIMEOUT_SECONDS", "90"))
+    SEARCH_TIMEOUT_SECONDS = int(os.getenv("SEARCH_TIMEOUT_SECONDS", "20"))
+
+    MAX_HISTORY_ITEMS = int(os.getenv("MAX_HISTORY_ITEMS", "5"))
+    MAX_CODE_CHARS = int(os.getenv("MAX_CODE_CHARS", "25000"))
+    MAX_ERROR_CHARS = int(os.getenv("MAX_ERROR_CHARS", "8000"))
+
+    MAX_STACK_RESULTS = int(os.getenv("MAX_STACK_RESULTS", "5"))
+    MAX_GITHUB_RESULTS = int(os.getenv("MAX_GITHUB_RESULTS", "5"))
+    MAX_RETRIEVED_ITEMS = int(os.getenv("MAX_RETRIEVED_ITEMS", "8"))
+
+    ENABLE_STACK_SEARCH = os.getenv("ENABLE_STACK_SEARCH", "true").lower() == "true"
+    ENABLE_GITHUB_SEARCH = os.getenv("ENABLE_GITHUB_SEARCH", "true").lower() == "true"
+    ENABLE_RETRIEVAL_FOR_FIX = os.getenv("ENABLE_RETRIEVAL_FOR_FIX", "true").lower() == "true"
+    ENABLE_RETRIEVAL_FOR_DEBUG = os.getenv("ENABLE_RETRIEVAL_FOR_DEBUG", "true").lower() == "true"
+    ENABLE_RETRIEVAL_FOR_GENERATE = os.getenv("ENABLE_RETRIEVAL_FOR_GENERATE", "false").lower() == "true"
+    ENABLE_RETRIEVAL_FOR_EXPLAIN = os.getenv("ENABLE_RETRIEVAL_FOR_EXPLAIN", "false").lower() == "true"
+
+    DEFAULT_TEMPERATURE = float(os.getenv("DEFAULT_TEMPERATURE", "0.2"))
+    DEFAULT_TOP_P = float(os.getenv("DEFAULT_TOP_P", "0.9"))
+
+    ALLOWED_TASK_TYPES = {
+        "generate",
+        "fix",
+        "explain",
+        "refactor",
+        "review",
+        "unknown",
+    }
+
+
+settings = Settings()