Cloudimage: Absolute URLs bypass CDN and baseURL requirement creates friction with multi-origin backends

Description

In real-world setups, images often come as full URLs from multiple backends (CMS/DAM/microservices). The current Cloudimage provider requires a single baseURL and returns absolute src as-is, which:

• Bypasses the Cloudimage CDN for absolute URLs.
• Forces consumers to strip origins or maintain per-domain mappings.
• Doesn't scale when multiple origins exist.

This leads to unnecessary complexity and inconsistent behavior.

Steps to Reproduce

Scenario 1: No baseURL, src is absolute

1. Configure Cloudimage with token: "demo", apiVersion: "v7", no baseURL.
2. Call:

   getImage("https://example.com/image.jpg", { modifiers: { width: 200 } })

3. Observe the returned URL.

Scenario 2: baseURL set, src is absolute

1. Configure Cloudimage with token: "demo", apiVersion: "v7", baseURL: "_sl_".
2. Call:

   getImage("https://example.com/image.jpg", { modifiers: { width: 200 } })

3. Observe the returned URL.

Actual Behavior

• Absolute src is returned as-is or behavior is ambiguous/bypasses Cloudimage when baseURL is set, pushing origin-stripping logic to the app.

Expected Behavior

• Absolute sources (or relative sources without baseURL) should be routed via the Cloudimage CDN base:
  • https://{token}.cloudimg.io/{apiVersion}/https://example.com/image.jpg?width=200
• baseURL should be optional and used only when joining a relative src.

Impact

• Extra app-side logic to normalize/strip origins.
• Fragile regex/mapping per backend domain.
• Inconsistent CDN usage across inputs.
• Poor scalability when integrating multiple services/domains.

Proposed Solution

• Make baseURL optional.
• URL construction:
  • If src is absolute OR baseURL is missing: joinURL(CDN_BASE, src) + query
  • Else (relative src + provided baseURL): joinURL(CDN_BASE, baseURL, src) + query
• Compute CDN base when cdnURL is unset: https://{token}.cloudimg.io/{apiVersion}
• Dev warning only when both token and cdnURL are missing.