fix(runtime-vapor): preserve correct parent instance for slotted content

[Copilot]

Slot content in Vapor components was referencing the wrong component instance, breaking features like inject/provide, template refs, and scoped IDs.

Changes

• Added withVaporCtx helper in runtime-vapor/src/componentSlots.ts to capture and restore the correct currentInstance when slot functions execute
• Updated compiler to wrap all slot functions with withVaporCtx() in compiler-vapor/src/generators/component.ts
• Handles currentSlotConsumer to maintain proper parent-child relationships in forwarded slots scenarios

This mirrors the withCtx pattern used in the standard Vue runtime for the same purpose.

Example

// Slot function is now wrapped to preserve instance context
const slot = withVaporCtx(() => {
  // currentInstance is correctly set to slot owner
  const value = inject('key') // Works correctly
  return createElements()
})

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