[AI-assisted] Add MiniMax Watcher provider configuration

[octo-patch]

Reason: Add first-class MiniMax configuration to the Watcher.

This change:

• declares MiniMax-M3 and MiniMax-M2.7 with current context, pricing, input, and thinking metadata
• adds global_en and cn_zh endpoint selection through typed provider settings
• supports explicit configuration and daemon environment selection while preserving existing default behavior

AI-assisted: yes. Testing: full Python suite plus focused lint, formatting, and type checks.

Checks:

• .venv/bin/python -m pytest (262 passed, 3 skipped)
• .venv/bin/python -m ruff check clawkeeper_core/watcher/providers.py clawkeeper_core/watcher/__init__.py tests/test_watcher_provider.py
• .venv/bin/python -m ruff format --check clawkeeper_core/watcher/providers.py clawkeeper_core/watcher/__init__.py tests/test_watcher_provider.py
• .venv/bin/python -m mypy clawkeeper_core/watcher/providers.py
• git diff --check

[octo-patch]

Updated the MiniMax regional endpoint definitions to include the OpenAI-compatible URL, Anthropic-compatible URL, and documentation root for both regions, and pushed a new commit. I ran Ruff on the provider and test files, 26 Watcher tests, and mypy on the provider module.