新增解答题拍照判分:百炼 Qwen-VL 按评分点逐点判分,无 API Key 时演示判分回退;混合卷按真实分值加权计分;判分照片与评分点进错题本;补齐历史迁移缺口(0005 模板生效方式/0006 五张缺失表+grammar_progress point_id)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

drizzle/0004_ai-grade-log.sql

@@ -0,0 +1,22 @@
+CREATE TABLE `ai_grade_log` (
+	`id` bigint AUTO_INCREMENT NOT NULL,
+	`child_user_id` bigint NOT NULL,
+	`paper_id` varchar(191) NOT NULL,
+	`question_index` int NOT NULL,
+	`oss_key` varchar(300) NOT NULL,
+	`status` varchar(20) NOT NULL,
+	`earned` int NOT NULL DEFAULT 0,
+	`points` int NOT NULL DEFAULT 0,
+	`verdict` text,
+	`mock` boolean NOT NULL DEFAULT false,
+	`model` varchar(60),
+	`ms` int,
+	`created_at` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP,
+	CONSTRAINT `ai_grade_log_id` PRIMARY KEY(`id`)
+);
+--> statement-breakpoint
+ALTER TABLE `ai_grade_log` ADD CONSTRAINT `ai_grade_log_child_user_id_user_id_fk` FOREIGN KEY (`child_user_id`) REFERENCES `user`(`id`) ON DELETE cascade ON UPDATE no action;
+--> statement-breakpoint
+CREATE INDEX `idx_ai_grade_child_date` ON `ai_grade_log` (`child_user_id`,`created_at`);
+--> statement-breakpoint
+CREATE INDEX `idx_ai_grade_paper_q` ON `ai_grade_log` (`child_user_id`,`paper_id`,`question_index`);