* chore(deps): upgrade Angular to 22.1 and Nx to 23.2
* fix(deps): complete Angular migrations after rebasing on master
* fix(ci): use the Node pin for Windows runtime refresh
* docs(deps): synchronize the workspace-shell Node requirements
- Introduced `stalker-mock-server` with TypeScript configuration for local development and testing.
- Updated `playwright.config.ts` to run both Angular app and mock server in parallel during e2e tests.
- Created comprehensive e2e tests for Stalker portal functionality, including health checks, portal addition, and content loading.
- Added detailed architecture documentation for both `stalker-mock-server` and `xtream-mock-server`, outlining design decisions, data flow, and API protocols.
- Implemented `xtream-mock-server` to simulate Xtream Codes API for local development and testing, with corresponding e2e tests.
- Enhanced test isolation by resetting mock server state before each test run.
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