chore(master): release 5.0.0

[github-actions]

🤖 I have created a release beep boop

5.0.0 (2026-05-31)

⚠ BREAKING CHANGES

• persistence API removed entirely (load, save, key, autosave, customEncode, customDecode, customSave, customLoad, serialize, deserialize, SharedValueStorage). Use external persistence solutions and set SharedValue.$ directly.
• shared_preferences is no longer a dependency. load()/save() require customSave/customLoad callbacks. Users who relied on the built-in SharedPreferences persistence must provide their own callbacks.
• rxdart is no longer a transitive dependency. Consumers who relied on rxdart being pulled in transitively must add it directly.

Features

• clean API redesign — remove persistence, optimize internals (145c65f)
• remove rxdart dependency (7b8a6ec)
• remove shared_preferences dependency, make persistence pluggable (5906895)

Bug Fixes

• add # Changelog header to fix release-please insertion order (7815ec7)

Miscellaneous

• clean up .gitignore and remove tracked IDE/generated files (b2438b3)

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This PR was generated with Release Please. See documentation.

[github-actions]

🤖 Created releases:

• v5.0.0

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