refactor: Replace 'any' types with 'unknown' for better type safety

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

Author: Copilot

packages/objectstack/runtime/src/index.ts

@@ -37,7 +37,7 @@ export interface RuntimePlugin {
  */
 export class ObjectStackKernel {
     /** Query interface (QL) */
-    public ql: any = null;
+    public ql: unknown = null;
 
     constructor(plugins: RuntimePlugin[] = []) {
         // Stub implementation
@@ -59,22 +59,22 @@ export class ObjectStackKernel {
     }
 
     /** Find records */
-    async find(objectName: string, query: any): Promise<{ value: any[]; count: number }> {
+    async find(objectName: string, query: unknown): Promise<{ value: unknown[]; count: number }> {
         return { value: [], count: 0 };
     }
 
     /** Get a single record */
-    async get(objectName: string, id: string): Promise<any> {
+    async get(objectName: string, id: string): Promise<unknown> {
         return {};
     }
 
     /** Create a record */
-    async create(objectName: string, data: any): Promise<any> {
+    async create(objectName: string, data: unknown): Promise<unknown> {
         return data;
     }
 
     /** Update a record */
-    async update(objectName: string, id: string, data: any): Promise<any> {
+    async update(objectName: string, id: string, data: unknown): Promise<unknown> {
         return data;
     }
 
@@ -84,12 +84,12 @@ export class ObjectStackKernel {
     }
 
     /** Get metadata for an object */
-    getMetadata(objectName: string): any {
+    getMetadata(objectName: string): unknown {
         return {};
     }
 
     /** Get view configuration */
-    getView(objectName: string, viewType?: 'list' | 'form'): any {
+    getView(objectName: string, viewType?: 'list' | 'form'): unknown {
         return null;
     }
 }

packages/objectstack/spec/src/index.ts

@@ -28,7 +28,7 @@ export interface FilterNode {
     type: 'and' | 'or' | 'not' | 'comparison';
     operator?: string;
     field?: string;
-    value?: any;
+    value?: string | number | boolean | null | Date;
     children?: FilterNode[];
 }
 
@@ -147,7 +147,7 @@ export interface Field {
     /** Whether the field is searchable */
     searchable?: boolean;
     /** Default value */
-    defaultValue?: any;
+    defaultValue?: string | number | boolean | null;
     /** Maximum length for strings */
     maxLength?: number;
     /** Minimum length for strings */
@@ -165,7 +165,7 @@ export interface Field {
     /** Reference to another object (for lookup/master_detail) */
     reference?: string;
     /** Filters for reference field */
-    referenceFilters?: any;
+    referenceFilters?: FilterCondition;
     /** Whether write requires master read permission */
     writeRequiresMasterRead?: boolean;
     /** Summary expression */
@@ -332,9 +332,9 @@ export interface DriverInterface {
  */
 export interface DriverOptions {
     /** Connection string or configuration */
-    connection?: string | any;
+    connection?: string | Record<string, unknown>;
     /** Additional driver-specific options */
-    [key: string]: any;
+    [key: string]: unknown;
 }
 
 /**