chore(data-ana): 更新工作进度跟踪与ISSUE状态，补建基础设施脚本，清理遗留代码

- workline: 追加 §6 实现进度跟踪（P2-P5 已完成，P6 未开始）

- issue: 更新 §0.2/§0.3 核查表，proto 文件已全部补全

- 新增 scripts/clickhouse_ddl.sql（5 宽表建表脚本）

- 新增 scripts/seed_clickhouse.py（mock 种子数据脚本）

- 删除遗留代码 clickhouse_client.py 和 health.py

services/data-ana/scripts/clickhouse_ddl.sql

@@ -0,0 +1,87 @@
+-- data-ana ClickHouse DDL：5 宽表建表脚本
+-- 对齐 02-architecture-design.md §3 DDL 设计
+-- 引擎：ReplacingMergeTree（幂等消费保证）+ MergeTree（历史快照）
+-- 使用方式：clickhouse-client --multiquery < scripts/clickhouse_ddl.sql
+
+CREATE DATABASE IF NOT EXISTS edu_analytics;
+
+-- §3.1 学生学情宽表
+CREATE TABLE IF NOT EXISTS edu_analytics.student_dashboard_view
+(
+    student_id         String,
+    class_id           String,
+    exam_id            String,
+    subject_id         String,
+    score              Float64,
+    rank_in_class      UInt32,
+    knowledge_point_id String,
+    mastery_level      Float32,
+    error_count        UInt32,
+    last_updated       DateTime64(3, 'UTC')
+)
+ENGINE = ReplacingMergeTree(last_updated)
+PARTITION BY toYYYYMM(last_updated)
+ORDER BY (student_id, exam_id, knowledge_point_id)
+SETTINGS index_granularity = 8192;
+
+-- §3.2 学生错题本
+CREATE TABLE IF NOT EXISTS edu_analytics.student_errors
+(
+    student_id          String,
+    question_id         String,
+    knowledge_point_id  String,
+    error_count         UInt32,
+    last_error_time     DateTime64(3, 'UTC'),
+    content             String
+)
+ENGINE = ReplacingMergeTree(last_error_time)
+PARTITION BY toYYYYMM(last_error_time)
+ORDER BY (student_id, question_id);
+
+-- §3.3 知识点掌握度历史快照
+CREATE TABLE IF NOT EXISTS edu_analytics.mastery_snapshot
+(
+    student_id          String,
+    knowledge_point_id  String,
+    subject_id          String,
+    mastery_level       Float32,
+    calculated_at       DateTime64(3, 'UTC'),
+    calculation_method  LowCardinality(String)
+)
+ENGINE = MergeTree
+PARTITION BY toYYYYMM(calculated_at)
+ORDER BY (student_id, knowledge_point_id, calculated_at);
+
+-- §3.4 AI 用量计费记录
+CREATE TABLE IF NOT EXISTS edu_analytics.ai_usage_log
+(
+    request_id          String,
+    user_id             String,
+    provider            LowCardinality(String),
+    model               LowCardinality(String),
+    prompt_tokens       UInt32,
+    completion_tokens   UInt32,
+    total_tokens        UInt32,
+    latency_ms          UInt32,
+    success             Boolean,
+    cost_cents          UInt32,
+    occurred_at         DateTime64(3, 'UTC')
+)
+ENGINE = ReplacingMergeTree(occurred_at)
+PARTITION BY toYYYYMM(occurred_at)
+ORDER BY (request_id);
+
+-- §3.5 学生考勤记录
+CREATE TABLE IF NOT EXISTS edu_analytics.attendance_logs
+(
+    student_id          String,
+    class_id            String,
+    attendance_date     Date,
+    status              LowCardinality(String),
+    recorded_by         String,
+    remark              String DEFAULT '',
+    occurred_at         DateTime64(3, 'UTC')
+)
+ENGINE = ReplacingMergeTree(occurred_at)
+PARTITION BY toYYYYMM(attendance_date)
+ORDER BY (student_id, class_id, attendance_date);