feat(perps): fulfillment comp

[ishay-starkware]

Note

Introduces a dedicated Fulfillment component and refactors Core and Vault flows to use it for order/request fulfillment instead of inline maps and errors.

• Core:
  • Fulfillment integration: Registers new FulfillmentComponent (storage, events) and replaces inline fulfillment map/method with fulfillment.update_fulfillment in trade and liquidate flows.
  • Cleanup: Removes core-level fulfillment storage and fulfillment_exceeded_err from errors.cairo; minor import tidy-ups.
• Vault:
  • Fulfillment integration: Adds FulfillmentComponent dependency; uses update_fulfillment during deposit_into_vault and redeem_from_vault validations.
  • Cleanup: Removes fulfilled_vault_requests tracking and the VAULT_REQUEST_ALREADY_FULFILLED error; streamlines storage/imports.
• Components:
  • New module: components/fulfillment with FulfillmentComponent (stores per-order fulfillment and enforces overfill via FULFILLMENT_EXCEEDED).

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