fix: keep MaiBot import reviews categorized

[EterUltimate]

Summary

• keep MaiBot imported expressions, jargons, and memories mapped to separate review destinations instead of showing everything as persona learning
• add batch approve/reject APIs for style learning reviews and jargon candidates
• expose batch review actions in both the standalone WebUI and AstrBot embedded dashboard
• bump release metadata to 3.2.7 and document the fixes

Fixes #188
Fixes #189

Tests

• python -m pytest tests/unit/test_maibot_learning_importer.py tests/unit/test_jargon_service.py tests/unit/test_learning_chain_regressions.py tests/integration/test_webui_static_assets.py tests/integration/test_jargon_blueprint.py tests/integration/test_learning_content_blueprint.py -q
• python -m ruff check core/page_api.py services/integration/maibot_learning_importer.py webui/services/learning_service.py webui/services/jargon_service.py webui/blueprints/learning.py webui/blueprints/jargon.py tests/unit/test_maibot_learning_importer.py tests/unit/test_jargon_service.py tests/unit/test_learning_chain_regressions.py tests/integration/test_webui_static_assets.py tests/integration/test_jargon_blueprint.py tests/integration/test_learning_content_blueprint.py
• git diff --check

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