Add URL inventory and file URL normalization

[hissy]

Summary

• Add a URL inventory dashboard (CSV import, batch assign/unassign, status sync, manual page linking) for tracking source URLs through import.
• Add transformers that resolve relative file/image/link URLs to absolute URLs under a document root, without uploading files.
• Normalize . / .. path segments during file import and bump the package to 1.2.0.

Test plan

• Upgrade the package to 1.2.0 and confirm the new URLs dashboard page appears
• Import a Screaming Frog (or similar) CSV, map columns/filters, and verify rows are upserted
• Assign/unassign/remove URLs and confirm batch sourcePath stays in sync
• Run a batch import and verify URL status updates from logs (and via Refresh Status)
• Manually set an imported page on a URL and confirm it is marked imported / unassigned from its batch
• Use Normalize File URL transformers on attribute and HTML content and confirm relative URLs become absolute
• Import a file URL containing ../ and confirm path segments are normalized

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