refactor(web): restructure Vue3 app layout

memora-api/sql/init.sql

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+-- 初始化数据库
+CREATE DATABASE IF NOT EXISTS memora DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
+USE memora;
+
+-- 标准单词表
+CREATE TABLE IF NOT EXISTS words (
+    id BIGINT PRIMARY KEY AUTO_INCREMENT,
+    word VARCHAR(100) NOT NULL UNIQUE COMMENT '单词',
+    phonetic_uk VARCHAR(255) COMMENT '英式音标',
+    phonetic_us VARCHAR(255) COMMENT '美式音标',
+    audio_uk VARCHAR(500) COMMENT '英式音频文件路径',
+    audio_us VARCHAR(500) COMMENT '美式音频文件路径',
+    part_of_speech VARCHAR(50) COMMENT '词性',
+    definition TEXT COMMENT '标准释义',
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+    INDEX idx_word (word)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
+-- 记忆记录表
+CREATE TABLE IF NOT EXISTS memory_records (
+    id BIGINT PRIMARY KEY AUTO_INCREMENT,
+    word_id BIGINT NOT NULL COMMENT '关联words表',
+    user_id BIGINT DEFAULT 1 COMMENT '用户ID',
+    correct_count INT DEFAULT 0 COMMENT '正确次数',
+    total_count INT DEFAULT 0 COMMENT '总复习次数',
+    mastery_level INT DEFAULT 0 COMMENT '掌握程度 0-5',
+    last_reviewed_at TIMESTAMP NULL COMMENT '上次复习时间',
+    next_review_at TIMESTAMP NULL COMMENT '下次复习时间',
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+    INDEX idx_word_id (word_id),
+    INDEX idx_user_id (user_id),
+    INDEX idx_next_review (next_review_at),
+    FOREIGN KEY (word_id) REFERENCES words(id) ON DELETE CASCADE
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;