Implement Google Drive support on iOS + update service docs

[jacobras]

Implement Google Drive support on iOS + update service docs with guidance on registration.

Fixes #78

[Copilot]

Pull request overview

This PR adds iOS authentication support for Google Drive and updates the documentation site and README(s) to reflect expanded platform support and new registration guidance for each cloud provider.

Changes:

• Add Google Drive PKCE auth flow on iOS and wire it into the iOS demo app.
• Update service docs (Dropbox/Google Drive/OneDrive) with registration instructions and screenshots; add a new “Vision” doc page.
• Bump library version to 0.7.0 and refresh README/docs content accordingly.

Reviewed changes

Copilot reviewed 16 out of 20 changed files in this pull request and generated 10 comments.

Show a summary per file

File	Description
README.md	Updates feature list, support matrix, and installation version.
mkdocs.yml	Updates nav to include a new “Vision” page under “Introduction”.
library/src/iosMain/kotlin/nl/jacobras/cloudbridge/service/googledrive/authenticate.kt	Adds Google Drive iOS PKCE authenticate entrypoint.
library/src/iosMain/kotlin/nl/jacobras/cloudbridge/auth/startWebFlow.kt	Tweaks redirect scheme parsing for iOS web auth session.
gradle.properties	Bumps project version to 0.7.0.
docs/Vision.md	Adds a dedicated page describing design principles/vision.
docs/services/snippets/desktop.md	Minor wording update for desktop auth snippet.
docs/services/Overview.md	Updates Google Drive support status and clarifies terminology.
docs/services/OneDrive.md	Adds registration guidance and screenshot.
docs/services/GoogleDrive.md	Adds iOS auth docs + registration guidance + screenshots.
docs/services/Dropbox.md	Adds registration guidance and screenshot.
docs/README.md	Updates version and adds warning about token refresh limitations.
demo/shared/src/iosMain/kotlin/nl/jacobras/cloudbridge/demo/MainViewController.kt	Adds iOS demo authentication flow for Google Drive.
demo/shared/build.gradle.kts	Adds iOS Google Drive client ID BuildConfig entry.
demo/iosApp/iosApp.xcodeproj/xcuserdata/jacobras.xcuserdatad/xcschemes/iosApp.xcscheme	Adds an Xcode scheme file under user-specific xcuserdata.
demo/iosApp/Configuration/Config.xcconfig	Changes the iOS demo bundle identifier.

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