feat: add global LLM no-reply prefixes

[iuiu-py]

Motivation

Fixes #9563.

AstrBot currently has no global way to say "messages with this prefix are intentionally not for the LLM." This makes it difficult to reserve CLI-like prefixes while still allowing commands and plugins to handle those messages.

Modifications

• Add provider_settings.llm_no_reply_prefixes, defaulting to an empty list.
• Add WebUI metadata for the string-list setting next to the existing provider wake-prefix setting.
• Detect configured prefixes on the original stripped message before wake prefixes are removed, so /style 1 still matches / after the wake prefix is stripped to style 1.
• Mark matching events internally and skip only the normal LLM fallback; plugin-provided ProviderRequest objects continue to run.
• Ignore blank prefixes and preserve case-sensitive prefix matching.
• Document the setting in both English and Chinese configuration references.

Tests

• Added focused unit tests for configuration metadata, original-prefix matching after wake stripping, blank-prefix handling, and normal/plugin LLM request gating.
• uv run pytest -q tests/unit/test_llm_no_reply_prefixes.py — 6 passed.
• uv run pytest -q tests/unit — 1362 passed, 25 skipped.
• uv run ruff format --check . and uv run ruff check . — passed.

Summary by Sourcery

Add configurable no-reply prefixes to prevent selected messages from triggering ordinary LLM responses without blocking command or plugin processing.

New Features:

• Add a configurable global list of prefixes that suppresses normal LLM fallback requests while leaving command and plugin handling available.

Enhancements:

• Detect no-reply prefixes against the original message before wake-prefix processing, with case-sensitive matching and blank-prefix exclusion.

Documentation:

• Document the new no-reply prefix setting in English and Chinese configuration references.

Tests:

• Add unit coverage for configuration metadata, prefix detection, blank prefixes, and normal versus plugin LLM request handling.

[sourcery-ai]

Hey - I've reviewed your changes and they look great!

Sourcery assessment

Approved.

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