refactor: restructure permission handling and enhance Guard functionality

- Introduced a new `createGuard` function to streamline the creation of Guard instances with permissions and roles.
- Updated tests in `authorize.spec.ts` to reflect changes in permission checks, ensuring they now return undefined for denied permissions.
- Added new `Permission` and `Policy` classes to improve type safety and flexibility in permission management.
- Refactored middleware and controller files to utilize the updated permission structure, including context handling for permissions.
- Created a new `SystemController.spec.ts` file to test the integration of the new permission system within the SystemController.
- Removed legacy permission handling from core security files, consolidating permission logic within the new structure.

app/src/auth/authorize/Policy.ts

@@ -0,0 +1,42 @@
+import { s, parse, recursivelyReplacePlaceholders } from "bknd/utils";
+import * as query from "core/object/query/object-query";
+
+export const policySchema = s
+   .strictObject({
+      description: s.string(),
+      condition: s.object({}).optional() as s.Schema<{}, query.ObjectQuery | undefined>,
+      effect: s.string({ enum: ["allow", "deny", "filter"], default: "allow" }),
+      filter: s.object({}).optional() as s.Schema<{}, query.ObjectQuery | undefined>,
+   })
+   .partial();
+export type PolicySchema = s.Static<typeof policySchema>;
+
+export class Policy<Schema extends PolicySchema = PolicySchema> {
+   public content: Schema;
+
+   constructor(content?: Schema) {
+      this.content = parse(policySchema, content ?? {}, {
+         withDefaults: true,
+      }) as Schema;
+   }
+
+   replace(context: object, vars?: Record<string, any>) {
+      return vars ? recursivelyReplacePlaceholders(context, /^@([a-zA-Z_\.]+)$/, vars) : context;
+   }
+
+   meetsCondition(context: object, vars?: Record<string, any>) {
+      return query.validate(this.replace(this.content.condition!, vars), context);
+   }
+
+   meetsFilter(subject: object, vars?: Record<string, any>) {
+      return query.validate(this.replace(this.content.filter!, vars), subject);
+   }
+
+   getFiltered<Given extends any[]>(given: Given): Given {
+      return given.filter((item) => this.meetsFilter(item)) as Given;
+   }
+
+   toJSON() {
+      return this.content;
+   }
+}