Add Video Learning Agent for short video platforms

Features:
- VideoLearningAgent for automated video watching on Douyin/Kuaishou/TikTok
- Web dashboard UI for video learning sessions
- Real-time progress tracking with screenshot capture
- App detection using get_current_app() for accurate recording
- Session management with pause/resume/stop controls

Technical improvements:
- Simplified video detection logic using direct app detection
- Full base64 hash for sensitive screenshot change detection
- Immediate stop when target video count is reached
- Fixed circular import issues with ModelConfig

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

dashboard/config.py

@@ -39,6 +39,13 @@ class DashboardConfig:
     MODEL_BASE_URL: str = os.getenv("PHONE_AGENT_BASE_URL", "http://localhost:8000/v1")
     MODEL_NAME: str = os.getenv("PHONE_AGENT_MODEL", "autoglm-phone-9b")
     MODEL_API_KEY: str = os.getenv("PHONE_AGENT_API_KEY", "EMPTY")
+    MAX_TOKENS: int = int(os.getenv("PHONE_AGENT_MAX_TOKENS", "3000"))
+    TEMPERATURE: float = float(os.getenv("PHONE_AGENT_TEMPERATURE", "0.0"))
+    TOP_P: float = float(os.getenv("PHONE_AGENT_TOP_P", "0.85"))
+    FREQUENCY_PENALTY: float = float(os.getenv("PHONE_AGENT_FREQUENCY_PENALTY", "0.2"))
+
+    # Video learning settings
+    VIDEO_LEARNING_OUTPUT_DIR: str = os.getenv("VIDEO_LEARNING_OUTPUT_DIR", "./video_learning_data")
 
     # Task history
     MAX_TASK_HISTORY: int = int(os.getenv("MAX_TASK_HISTORY", "100"))