Add permission check handlers for extensions

- Add check.rs with Tauri commands for checking web, database, and filesystem permissions
- Implement handlePermissionsMethodAsync in frontend to route permission checks
- Register permission check commands in lib.rs
- Add toast notification for permission denied errors in web requests
- Extensions can now check permissions before operations via SDK

src-tauri/src/extension/permissions/check.rs

@@ -0,0 +1,64 @@
+// src-tauri/src/extension/permissions/commands.rs
+
+use crate::extension::error::ExtensionError;
+use crate::extension::permissions::manager::PermissionManager;
+use crate::AppState;
+use tauri::State;
+
+#[tauri::command]
+pub async fn check_web_permission(
+    extension_id: String,
+    method: String,
+    url: String,
+    state: State<'_, AppState>,
+) -> Result<(), ExtensionError> {
+    PermissionManager::check_web_permission(&state, &extension_id, &method, &url).await
+}
+
+#[tauri::command]
+pub async fn check_database_permission(
+    extension_id: String,
+    resource: String,
+    operation: String,
+    state: State<'_, AppState>,
+) -> Result<(), ExtensionError> {
+    let action = match operation.as_str() {
+        "read" => crate::extension::permissions::types::Action::Database(
+            crate::extension::permissions::types::DbAction::Read,
+        ),
+        "write" => crate::extension::permissions::types::Action::Database(
+            crate::extension::permissions::types::DbAction::ReadWrite,
+        ),
+        _ => {
+            return Err(ExtensionError::ValidationError {
+                reason: format!("Invalid database operation: {}", operation),
+            })
+        }
+    };
+
+    PermissionManager::check_database_permission(&state, &extension_id, action, &resource).await
+}
+
+#[tauri::command]
+pub async fn check_filesystem_permission(
+    extension_id: String,
+    path: String,
+    operation: String,
+    state: State<'_, AppState>,
+) -> Result<(), ExtensionError> {
+    let action = match operation.as_str() {
+        "read" => crate::extension::permissions::types::Action::Filesystem(
+            crate::extension::permissions::types::FsAction::Read,
+        ),
+        "write" => crate::extension::permissions::types::Action::Filesystem(
+            crate::extension::permissions::types::FsAction::ReadWrite,
+        ),
+        _ => {
+            return Err(ExtensionError::ValidationError {
+                reason: format!("Invalid filesystem operation: {}", operation),
+            })
+        }
+    };
+
+    PermissionManager::check_filesystem_permission(&state, &extension_id, action, &path).await
+}