Introduce a UI doc parameter and conditional content across modular-crm tutorial parts (part-04..part-08). Adds //[doc-params] JSON to enable MVC or Angular (NG) variants, inserts conditional blocks for screenshots and instructions, and adds Angular-specific guidance (proxy generation, component/template code, menu/routes, and build steps). Also includes small wording clarifications for Swagger/UX and updates summaries to reflect UI variants. TODO placeholders added for missing Angular screenshots.

Update modular CRM tutorial docs to include Angular symlink setup and startup steps. In part-04, remove the TODO screenshot placeholder and add a note to run `yarn symlinks:setup` from the root `angular` folder after installing a new Angular module (and again when adding more local modules). In part-07, replace the TODO screenshot note with instructions to run `yarn symlinks:setup` and `yarn start` from the `angular` folder to launch the app for validation.

Replace TODO screenshot placeholders with actual image links in modular CRM tutorial parts 02, 03, 05 and 06. This adds screenshots for the Angular Catalog and Ordering pages/components to help verify the UI integration and product/order listings.