FCE-3086: Use fishjam-react-native-webrtc as submodule in mobile-sdk

[MiloszFilimowski]

Description

• Add fishjam-react-native-webrtc as a git submodule + yarn workspace at packages/react-native-webrtc/.
• mobile-client consumes it via workspace:* for both dependencies and peerDependencies; yarn rewrites them at publish time so they can't drift.
• Drop the examples/mobile-client/common/plugins/ workaround — autolinking handles the symlinked workspace.
• Add check:webrtc-published: release blocks unless the submodule HEAD is at a git tag that's published on npm.
• CI workflows checkout submodules recursively; README + .prettierignore updated.

Motivation and Context

Removes the manual file: toggle flow for co-developing the SDK and the webrtc fork — clone with --recurse-submodules and yarn is enough.

Documentation impact

• Documentation update required
• Documentation updated in another PR
• No documentation update required

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to
  not work as expected)

[linear]

FCE-3086

[Copilot]

Pull request overview

This PR updates the monorepo to consume the fishjam-react-native-webrtc fork as a git submodule + Yarn workspace (packages/react-native-webrtc) and removes the previous Expo plugin workaround used for local development. It also adds a release-time guard to ensure the submodule points to a tagged, npm-published WebRTC version, and updates CI/README accordingly.

Changes:

• Add packages/react-native-webrtc as a git submodule and Yarn workspace; switch @fishjam-cloud/react-native-client to consume it via workspace:* and build it as part of its build/prepare flow.
• Remove examples/mobile-client/common/plugins/ local-webrtc-paths plugin usage and implementation; rely on autolinking + workspace symlink.
• Add check:webrtc-published release gate and update GitHub Actions workflows to checkout submodules recursively.

Reviewed changes

Copilot reviewed 22 out of 23 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
yarn.lock	Updates lockfile to reflect the new @fishjam-cloud/react-native-webrtc workspace and removed plugin workspace deps.
release-automation/check-webrtc-published.mjs	Adds a release automation script to verify the WebRTC submodule is pinned to a tagged commit and its package version is published on npm.
README.md	Updates contributor workflow to instruct cloning/init of git submodules.
packages/mobile-client/src/overrides/RTCPeerConnection.ts	Tightens typing of the stored RTC configuration using constructor parameter inference.
packages/mobile-client/README.md	Rewrites local WebRTC fork development instructions to use the submodule + workspace approach.
packages/mobile-client/package.json	Switches WebRTC dependency/peerDependency to workspace:*, adds build step to run the WebRTC workspace prepare, and adds check:webrtc-published.
package.json	Adds the WebRTC workspace and removes the example plugins workspace; adds a resolution for @types/react.
examples/mobile-client/fishjam-chat/app.json	Removes usage of the local WebRTC paths plugin from Expo config.
examples/mobile-client/common/plugins/tsconfig.json	Removes the shared plugins TypeScript config (plugin package removal).
examples/mobile-client/common/plugins/src/withLocalWebrtcPaths.ts	Removes the Expo config plugin entry point for local WebRTC path overrides.
examples/mobile-client/common/plugins/src/withLocalWebrtcIos.ts	Removes iOS Podfile modification logic for local WebRTC path overrides.
examples/mobile-client/common/plugins/src/withLocalWebrtcAndroid.ts	Removes Android settings.gradle modification logic for local WebRTC path overrides.
examples/mobile-client/common/plugins/src/utils.ts	Removes helper utilities used to detect file: WebRTC dependencies and generate config markers.
examples/mobile-client/common/plugins/package.json	Removes the shared plugins workspace package definition.
.prettierignore	Ignores formatting for the new submodule directory packages/react-native-webrtc.
.gitmodules	Adds the packages/react-native-webrtc submodule configuration.
.github/workflows/tests.yaml	Ensures CI checks out submodules recursively.
.github/workflows/release.yaml	Ensures CI checks out submodules recursively and adds the check:webrtc-published gate before publishing mobile-client.
.github/workflows/node.yaml	Ensures CI checks out submodules recursively.
.github/workflows/mobile_eas_build.yaml	Ensures CI checks out submodules recursively for EAS builds.
.github/workflows/livestreaming-example.yaml	Ensures CI checks out submodules recursively for the example workflow.
.github/workflows/fishjam-chat.yaml	Ensures CI checks out submodules recursively for the chat example workflow.

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