feat: add workspace to URL via /w/<workspace_id>/ prefix

[centdix]

Summary

• Adds workspace ID to frontend URLs: /scripts/get/f/foo → /w/<workspace_id>/scripts/get/f/foo
• Uses SvelteKit reroute hook to strip /w/<workspace> before route resolution — no file moves needed
• Updates goto() wrapper to auto-prefix workspace-scoped paths
• Adds wsBase store for <a href> links across ~50 components
• Backward-compatible: old URLs without /w/ redirect to new format
• Workspace switching via sidebar navigates to /w/<new_workspace>/current_path

Test plan

• Navigate to /w/<ws>/scripts — scripts page loads for correct workspace
• Click sidebar links — URLs include /w/<ws>/
• Switch workspace via sidebar — URL updates to /w/<new_ws>/current_path
• Old bookmark without /w/ — redirects to /w/<stored_ws>/...
• URL with ?workspace=X — redirects to /w/X/...
• Login → workspace select → navigates to /w/<ws>/
• Deep link /w/<ws>/flows/get/f/my_flow — opens correct flow
• Browser back/forward works across workspace switches

🤖 Generated with Claude Code

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