Refactor tools from class-based to function-based implementation
Convert SearchBlueskyTool, PostToBlueskyTool, and GetBlueskyFeedTool
from BaseTool classes to standalone functions. This simplifies the
tool architecture and aligns with the updated tool registration system.
Also update error handling to throw exceptions instead of returning
error strings, following the new coding principles.
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Co-Authored-By: Claude <noreply@anthropic.com>