Add docs guide: Transform Route Parameters for URL Rewrite

[zuplo-integrations-app]

Summary

• New docs guide explaining how to transform route parameter values in an inbound policy before the URL Rewrite handler forwards the request
• Addresses content gap identified in zuplo/www#2406 (P1 Intercom escalation requiring Loom video demo)
• Covers the recommended context.custom pattern, step-by-step example, lookup maps, multiple parameter transforms, and body transformation
• Fact-checked against Zuplo documentation

Content

Title: Transform Route Parameters for URL Rewrite
Type: Docs Guide
Slug: guides/transform-route-params-url-rewrite
Sidebar: Added under Development > Guides (next to related routing guides)

Fact-Check Results

• 16/18 claims verified against official Zuplo docs
• 0 incorrect claims found
• 2 claims about internal ${params.*} resolution behavior were softened since exact runtime behavior is not explicitly documented (the context.custom approach is well-documented and confirmed in multiple existing guides)
• All internal doc links verified to point to existing files
• All code examples follow correct function signatures, import paths, and configuration formats

Reviewer Feedback Applied

• Restructured heading hierarchy: merged "The Pattern" summary into "Step-by-Step Example" for better flow
• Moved anti-pattern explanation ("Why Not Modify request.params Directly?") after the tutorial as a "Common Pitfall" section with a :::caution admonition
• Grouped variation sections (Lookup Map, Multiple Parameters, Body Transformation) under a "Variations" heading
• Removed redundant headers parameter from ZuploRequest constructor example

Closes zuplo/www#2406

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Project	Deployment	Actions	Updated (UTC)
docs	Ready	Preview, Comment	Apr 20, 2026 0:45am