docs(key-wallet-ffi): regenerate FFI_API.md after dropping is_watch_only

The verify-ffi pre-commit hook flagged that key-wallet-ffi/FFI_API.md
still listed `managed_core_account_get_is_watch_only`, which this PR
removes. Regenerated to drop the entry.

Author: QuantumExplorer

key-wallet-ffi/FFI_API.md

@@ -4,7 +4,7 @@ This document provides a comprehensive reference for all FFI (Foreign Function I
 
 **Auto-generated**: This documentation is automatically generated from the source code. Do not edit manually.
 
-**Total Functions**: 259
+**Total Functions**: 258
 
 ## Table of Contents
 
@@ -140,7 +140,7 @@ Functions: 64
 
 ### Account Management
 
-Functions: 109
+Functions: 108
 
 | Function | Description | Module |
 |----------|-------------|--------|
@@ -238,7 +238,6 @@ Functions: 109
 | `managed_core_account_get_external_address_pool` | Get the external address pool from a managed account  This function returns... | managed_account |
 | `managed_core_account_get_index` | Get the account index from a managed account  Returns the primary account... | managed_account |
 | `managed_core_account_get_internal_address_pool` | Get the internal address pool from a managed account  This function returns... | managed_account |
-| `managed_core_account_get_is_watch_only` | Check if a managed account is watch-only  # Safety  - `account` must be a... | managed_account |
 | `managed_core_account_get_network` | Get the network of a managed account  # Safety  - `account` must be a valid... | managed_account |
 | `managed_core_account_get_transaction_count` | Get the number of transactions in a managed account  # Safety  - `account`... | managed_account |
 | `managed_core_account_get_transactions` | Get all transactions from a managed account  Returns an array of... | managed_account |
@@ -3170,22 +3169,6 @@ Get the internal address pool from a managed account  This function returns the
 
 ---
 
-#### `managed_core_account_get_is_watch_only`
-
-```c
-managed_core_account_get_is_watch_only(account: *const FFIManagedCoreAccount,) -> bool
-```
-
-**Description:**
-Check if a managed account is watch-only  # Safety  - `account` must be a valid pointer to an FFIManagedCoreAccount instance
-
-**Safety:**
-- `account` must be a valid pointer to an FFIManagedCoreAccount instance
-
-**Module:** `managed_account`
-
----
-
 #### `managed_core_account_get_network`
 
 ```c