v0.1.0-rc.5 Added MCP auth and schema annotations

✨ Features
- [mcp]: added optional Bearer token auth via header or query param
- [mcp]: added "set-token" command for easy authentication setup

♻️ Code Refactoring
- [mcp]: added strict input schemas and behavioral tool annotations
- [dateutil]: replaced heavy date parser with PHP-style strtotime
- [dateutil]: simplified dependencies by removing wazero and go-re2

🐛 Bug Fixes
- preferred ldflags version over build info pseudo-versions
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