feat: support external frontend modules

[guenhter]

No description provided.

[Copilot]

Pull request overview

Adds support for “external” frontend modules (dropped under frontend/omni/src/modules/external-*) that can bring their own npm dependencies via pnpm workspace package discovery, and validates it with a light e2e test fixture.

Changes:

• Introduce a pnpm-workspace.yaml so src/modules/external-* can be discovered as workspace packages, plus .gitignore/.npmrc adjustments to keep external modules out of git and avoid updating the root lockfile.
• Add a Playwright light e2e test that copies in an external module fixture with its own package.json dependency and asserts it executes at runtime.
• Update Biome schema references to 2.4.10 in frontend and full e2e configs and document the new workflow in README/CHANGELOG.

Reviewed changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
frontend/omni/README.md	Documents how external modules are discovered and how dependency installation works.
frontend/omni/pnpm-workspace.yaml	Declares src/modules/external-* as workspace packages.
frontend/omni/CHANGELOG.md	Notes the new external-module dependency capability.
frontend/omni/biome.json	Updates Biome schema URL.
frontend/omni/.npmrc	Sets shared-workspace-lockfile=false to avoid root lockfile changes from external packages.
frontend/omni/.gitignore	Ignores src/modules/external-* directories.
e2e_tests/tests_omni_light/playwright.config.ts	Switches frontend startup to a dedicated script.
e2e_tests/tests_omni_light/scripts/run-frontend.sh	Copies the external module fixture, extends the manifest, installs/builds, and starts preview.
e2e_tests/tests_omni_light/scripts/extend-light-modules-json.mjs	Generates public/modules.json by extending the browser-only manifest with fixture module entries.
e2e_tests/tests_omni_light/src/external-module-dependency.spec.ts	New e2e assertion that an external module dependency is installed and executed.
e2e_tests/tests_omni_light/fixtures/external-module-test/package.json	External module fixture with its own dependency.
e2e_tests/tests_omni_light/fixtures/external-module-test/ExternalTestSidebarItem.svelte	Fixture UI module that triggers the service factory.
e2e_tests/tests_omni_light/fixtures/external-module-test/externalTestService.svelte.ts	Fixture service factory importing an external npm dependency.
e2e_tests/tests_omni_full/biome.json	Updates Biome schema URL.

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