Revert "refactor: clean up legacy code, rename hopper to entity_extractor, and add third-party notices"

This reverts commit 54fcef9887.

Please do not submit unrelated docs and codes in the same commit. I am reverting this commit so that the related files can be submitted in better-organized future commits.

artemis/config/__init__.py

@@ -83,7 +83,6 @@ from artemis.config.constants import (
     ENV_ARTEMIS_TRACES_DIR,
     ENV_ARTEMIS_USE_FILE_API,
     ENV_ARTEMIS_USE_USER_DIR,
-    ENV_OPENROUTER_API_KEY,
     ENV_OPEN_ROUTER_API_KEY,
     ENV_OPENAI_API_KEY,
     ENV_OPENAI_BASE_URL,
@@ -101,6 +100,7 @@ from artemis.config.constants import (
     LLMUtilsNodeWithFallback,
 )
 from artemis.config.llm import (
+    CyFunctionDetector,
     LLM,
     LLMConfig,
     LLMConfigUtils,
@@ -196,6 +196,7 @@ __all__ = [
     "get_ls_address_file",
     "is_frozen_bundle",
     # LLM Config & Models
+    "CyFunctionDetector",
     "LLM",
     "LLMWithFallback",
     "LLMConfigUtils",
@@ -295,7 +296,6 @@ __all__ = [
     "ENV_OPENAI_API_KEY",
     "ENV_OPENAI_BASE_URL",
     "ENV_ANTHROPIC_API_KEY",
-    "ENV_OPENROUTER_API_KEY",
     "ENV_OPEN_ROUTER_API_KEY",
     "ENV_XAI_API_KEY",
     "ENV_ARTEMIS_EXPLORER_VERSION",