✨ feat(stock): add date notes entity and related schemas

- create DateNotes entity with fields: id, code, noteDate, note, createdAt, updatedAt
- add unique index on (code, noteDate)
- define DateNotesSchema for response validation
- create CreateDateNotesDto and UpdateDateNotesDto for request validation
- add database comments for entity fields

src/server/modules/stock/date-notes.entity.ts

@@ -0,0 +1,45 @@
+import { Entity, PrimaryGeneratedColumn, Column, Index } from 'typeorm';
+import { z } from '@hono/zod-openapi';
+
+@Entity('date_notes')
+@Index(['code', 'noteDate'], { unique: true })
+export class DateNotes {
+  @PrimaryGeneratedColumn({ unsigned: true })
+  id!: number;
+
+  @Column({ name: 'code', type: 'varchar', length: 255, nullable: false, comment: '股票代码' })
+  code!: string;
+
+  @Column({ name: 'note_date', type: 'timestamp', nullable: false, comment: '备注日期' })
+  noteDate!: Date;
+
+  @Column({ name: 'note', type: 'varchar', length: 255, nullable: false, comment: '备注内容' })
+  note!: string;
+
+  @Column({ name: 'created_at', type: 'timestamp', default: () => 'CURRENT_TIMESTAMP' })
+  createdAt!: Date;
+
+  @Column({ name: 'updated_at', type: 'timestamp', default: () => 'CURRENT_TIMESTAMP', onUpdate: 'CURRENT_TIMESTAMP' })
+  updatedAt!: Date;
+}
+
+export const DateNotesSchema = z.object({
+  id: z.number().int().positive().openapi({ description: 'ID', example: 1 }),
+  code: z.string().max(255).openapi({ description: '股票代码', example: '001339' }),
+  noteDate: z.date().openapi({ description: '备注日期', example: '2024-11-07T08:00:00Z' }),
+  note: z.string().max(255).openapi({ description: '备注内容', example: 'test01' }),
+  createdAt: z.date().openapi({ description: '创建时间', example: '2025-05-22T16:17:13Z' }),
+  updatedAt: z.date().openapi({ description: '更新时间', example: '2025-05-22T16:17:13Z' })
+});
+
+export const CreateDateNotesDto = z.object({
+  code: z.string().max(255).openapi({ description: '股票代码', example: '001339' }),
+  noteDate: z.date().openapi({ description: '备注日期', example: '2024-11-07T08:00:00Z' }),
+  note: z.string().max(255).openapi({ description: '备注内容', example: 'test01' })
+});
+
+export const UpdateDateNotesDto = z.object({
+  code: z.string().max(255).optional().openapi({ description: '股票代码', example: '001339' }),
+  noteDate: z.date().optional().openapi({ description: '备注日期', example: '2024-11-07T08:00:00Z' }),
+  note: z.string().max(255).optional().openapi({ description: '备注内容', example: 'test01' })
+});