feat: add dynamic rules update mechanism to decouple rules from packa…

[xiao201208]

[…ge releases](feat: add dynamic rules update mechanism to decouple rules from package releases)

Allow users to update transform rules without upgrading the package by pulling the latest rules directly from the GitHub repository.

Core changes:

• Add rostran/core/rules_updater.py: downloads rules from GitHub, caches them at ~/.rostran/rules/, and manages semantic versioning via rostran/rules/VERSION and VERSIONS.json (version-to-commit mapping).
• Modify RuleManager.load() to support dual-source loading: user-level cache takes precedence over built-in rules shipped with the package.
• Add CLI commands:
  • rostran update-rules with --version, --list, --force, --clean
  • rostran rules-version to show active rules source and version
• Move tools/tf_ali_ros_generate_mappings.json into rostran/rules/ so it is included in dynamic rules updates.

CI automation:

• Add auto_rules_version.yml: when rule files change on push/PR to main, automatically bump the patch version in VERSION and record the new version with commit SHA in VERSIONS.json.
• Add auto_version_bump.yml: when non-rules code changes on push/PR to main, automatically bump the patch version in rostran/init.py.
• Both workflows include loop-prevention guards.

Also:

• Add English and Chinese documentation for the new commands in docs/.
• Add 18 unit tests covering the updater, version management, and RuleManager fallback behavior.

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