chore(main): release 0.5.0

[alex-feel]

🚀 New Release

0.5.0 (2025-11-23)

Features

• add PostgreSQL backend with pgvector semantic search (03ad9b0)
• add storage backend abstraction for multi-database support (4e7744a)

Bug Fixes

• eliminate duplicate tool registration and improve naming (d46cb7c)
• eliminate redundant backend initializations during startup (dcd14d7)
• load sqlite-vec extension before semantic search migration (3069460)
• resolve asyncio primitives event loop binding issue (705fd9d)
• resolve integration test hang with persistent backend (35219db)

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[alex-feel]

🤖 Created releases:

• v0.5.0

🌻