feat: add optional local web UI

[IKJ-work]

Add a visual extraction workspace with HTTP, dynamic, and stealth modes, CSS/XPath selection, indexed SQLite history, exports, safety defaults, tests, documentation, and an RFC.

Proposed change

Type of change:

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests
• Add or change doctests? -- Note: Please avoid changing both code and tests in a single pull request.
• Documentation change?

Additional information

• This PR fixes or closes an issue: fixes #
• This PR is related to an issue: #
• Link to documentation pull request: **

Checklist:

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized.
• I know that pull requests will not be merged if they fail the automated tests.
• All new Python files are placed inside an existing directory.
• All filenames are in all lowercase characters with no spaces or dashes.
• All functions and variable names follow Python naming conventions.
• All function parameters and return values are annotated with Python type hints.
• All functions have doc-strings.

[IKJ-work]

make some chnages for UI