fix(paths): preserve full virtual paths for scoped users

[okatu-loli]

Scoped users can send a directory prefix twice, lose ancestor segments when following a role directory, or stay on a loading screen after a failed request. Use full virtual paths consistently and leave the user base path at /.

Changes

• Remove role-prefix guessing from list requests and relative navigation.
• Carry full virtual paths on synthetic role folders, including same-named folders under different parents, for list and grid navigation.
• Finish failed requests with a visible error instead of redirecting to the same path.
• Make the user base path read-only at / and stop deriving it from selected roles.
• Keep login redirect URLs encoded until navigation, so spaces, # and % survive login and preview.

Validation

• Production Vite build and formatting checks passed.
• Browser checks passed for multilevel/same-name list and grid navigation, failed-folder error state, special-character login redirect and text preview, and the migrated role/base-path management form.
• Installed TypeScript 4.7 stops on the pre-existing satisfies expression in src/store/obj.ts:300; that source is unchanged by this PR.

Coordinate release with AlistGo/alist#9641, which transfers non-root base restrictions to roles and keeps base paths at /.

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