feat: add city, diplomacy, general, nation, and helper constraints

- Implemented various constraints for city management including occupied, supplied, and capacity checks.
- Added diplomacy constraints to manage relationships between nations.
- Introduced general constraints to validate general states and resources.
- Created helper functions for reading entities and resolving IDs.
- Enhanced the overall logic for managing game state and constraints.

packages/logic/src/constraints/misc.ts

@@ -0,0 +1,22 @@
+import { allow } from './helpers.js';
+import type { Constraint } from './types.js';
+
+export const alwaysFail = (reason: string): Constraint => ({
+    name: 'AlwaysFail',
+    requires: () => [],
+    test: () => ({ kind: 'deny', reason }),
+});
+
+export const notOpeningPart = (
+    relYear: number,
+    openingPartYear: number
+): Constraint => ({
+    name: 'NotOpeningPart',
+    requires: () => [],
+    test: (_ctx) => {
+        if (relYear >= openingPartYear) {
+            return allow();
+        }
+        return { kind: 'deny', reason: '초반 제한 중에는 불가능합니다.' };
+    },
+});