[Docs] Flag: Swift SDK rewritten in pure Swift (powersync-swift#130)

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Suggested assignees: @benitav, @simolus3

What shipped: The PowerSync Swift SDK has been fully rewritten in native Swift, removing its internal dependency on the PowerSync Kotlin SDK and SKIE. The SDK now implements SqlCursor, the connection pool, sync client, schema serialization, and CRUD transactions directly in Swift using CSQLite, and loads the core extension via a direct function call instead of sqlite3_load_extension.

Why this needs docs: Major architecture change with user-facing breaking changes (CrudBatch, CrudEntry, and CrudTransaction are now concrete structs instead of protocols, internal withSession API removed, new typed opDataTyped / previousValuesTyped APIs on CrudEntry). It also directly contradicts current docs which describe the Swift SDK as being built on top of the Kotlin SDK via SKIE.

Likely affected pages/sections:

• client-sdks/reference/swift.mdx — "Kotlin -> Swift SDK" section (lines ~28-30) is now incorrect; remove or rewrite to reflect pure-Swift implementation.
• client-sdks/reference/swift.mdx — review CRUD samples (CrudBatch / CrudTransaction / CrudEntry) for the protocol-to-struct change; mention new typed accessors opDataTyped and previousValuesTyped.
• client-sdks/usage-examples.mdx — Swift CRUD upload example (~line 621, getCrudBatch()) should be reviewed.
• intro/setup-guide.mdx — Swift backend connector example (~line 943, getNextCrudTransaction()) should be reviewed.
• handling-writes/custom-conflict-resolution.mdx — verify Swift-specific CrudEntry snippets still apply with typed accessors.
• Any prerequisites/installation notes mentioning the Kotlin XCFramework dependency should be removed.

Source PR: powersync-ja/powersync-swift#130

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