[ndonkoHenri]

Stacked on #7000; review that one first. This PR shows only its own commit.

[tool.flet].platforms in the examples' pyproject.toml isn't a Flet setting: flet build and flet run ignore it. It tells the gallery and the docs which platforms an example supports; the docs use it to hide "Try Online" for examples that don't run on web.

Under [tool.flet], next to real settings like org and company, it reads like a build setting. It also ends up in the docs' pyproject.toml tab and in every project created with flet create --example, which both strip [tool.flet.gallery] and [tool.flet.metadata] but keep [tool.flet].

This PR moves it to [tool.flet.gallery].platforms in the 59 examples that set it:

[tool.flet.gallery]
categories = ["Pages/Page"]
platforms = ["macos", "windows", "linux"]

Two examples without a gallery table (apps/authentication/github_login_same_page and github_repos_browser) get one. The docs generator reads the new location, and the create-flet-example-projects skill tells agents to write it there.

Flet Studio's gallery needs to read [tool.flet.gallery].platforms before this merges. Otherwise it will treat the 59 platform-limited examples as supported everywhere.

Testing

• Every migrated pyproject.toml parses to the same data with only platforms moved (checked with tomllib).
• Regenerated docs data: "Try Online" shows for the same 554 of 576 examples as before.
• The docs' pyproject.toml tabs and a project created with flet create --example controls/core/page/window_resize no longer contain platforms.

Summary by Sourcery

Relocate example platform metadata to the gallery configuration and update consumers to use the new location.

Enhancements:

• Move example platform support metadata from [tool.flet].platforms to [tool.flet.gallery].platforms across the affected examples.
• Update documentation generation to determine web support from the gallery metadata location.
• Add gallery platform metadata to examples that previously lacked a gallery table.

Documentation:

• Update the example-project creation guidance to place platform metadata under [tool.flet.gallery].

Tests:

• Regenerate and validate documentation data while preserving existing web availability behavior.

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