feat: 邮件配置页面 + 数据库持久化

- 新增 /email 配置页面 + /api/email/config API (GET/POST)
- 新增 /api/email/test-send 测试邮件 + /api/email/reset 重置
- EmailConfig SQLite 表持久化配置，回退到环境变量
- mailer: get_config 优先读 DB，send_report 读取 DB 密码
- 修复 _send_smtp 登录使用环境变量密码的 bug
- 前端新增配置表单 (启用开关/SMTP/TLS/认证/发件人/收件人/时间)
- CSS 暗色主题样式 + 响应式适配
- 导航栏新增「设置」链接

app.py

@@ -700,6 +700,17 @@ def cleanup_old():
     return jsonify({"ok": True, "deleted": count})
 
 
+# ═══════════════════════════════════════════════════════════════════════════
+#  EmailConfig — 邮件配置持久化 (Web UI 写入, mailer 读取)
+# ═══════════════════════════════════════════════════════════════════════════
+class EmailConfig(db.Model):
+    __tablename__ = 'email_config'
+    id = db.Column(db.Integer, primary_key=True)
+    key = db.Column(db.String(50), unique=True, nullable=False)
+    value = db.Column(db.Text, nullable=False, default='')
+    updated_at = db.Column(db.DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+
+
 # ═══════════════════════════════════════════════════════════════════════════
 #  Email Routes (延迟导入 mailer, 避免在 mailer 缺失时整个 app 起不来)
 # ═══════════════════════════════════════════════════════════════════════════
@@ -756,6 +767,80 @@ def email_preview():
                     headers={"Content-Disposition": 'inline; filename="mail-preview.txt"'})
 
 
+@app.route("/email")
+def email_config():
+    """邮件配置页面。"""
+    return render_template("email_config.html")
+
+
+@app.route("/api/email/config")
+def email_config_api():
+    """获取完整邮件配置 (含密码, 仅本地管理用)。"""
+    ml = _get_mailer()
+    if not ml:
+        return jsonify({"ok": False, "error": "mailer.py 不可用"}), 500
+    cfg = ml.get_config_full()
+    errs = ml.config_errors(cfg)
+    return jsonify({
+        "ok": True,
+        "configured": len(errs) == 0,
+        "config_errors": errs,
+        **cfg,
+    })
+
+
+@app.route("/api/email/config", methods=["POST"])
+def email_config_save():
+    """保存邮件配置到数据库。"""
+    data = request.get_json(silent=True) or {}
+    ml = _get_mailer()
+    if not ml:
+        return jsonify({"ok": False, "error": "mailer.py 不可用"}), 500
+    try:
+        saved = ml.save_config(data)
+    except Exception as e:
+        return jsonify({"ok": False, "error": f"保存失败: {e}"}), 500
+    cfg = ml.get_config_full()
+    errs = ml.config_errors(cfg)
+    return jsonify({
+        "ok": True,
+        "saved": saved,
+        "configured": len(errs) == 0,
+        "config_errors": errs,
+    })
+
+
+@app.route("/api/email/reset", methods=["POST"])
+def email_config_reset():
+    """清除数据库配置, 回退到环境变量。"""
+    ml = _get_mailer()
+    if not ml:
+        return jsonify({"ok": False, "error": "mailer.py 不可用"}), 500
+    try:
+        ml.reset_config()
+    except Exception as e:
+        return jsonify({"ok": False, "error": f"重置失败: {e}"}), 500
+    cfg = ml.get_config_full()
+    errs = ml.config_errors(cfg)
+    return jsonify({
+        "ok": True,
+        "message": "已清除数据库配置, 回退到环境变量",
+        "configured": len(errs) == 0,
+        "config_errors": errs,
+    })
+
+
+@app.route("/api/email/test-send", methods=["POST"])
+def email_test_send():
+    """发送测试邮件 (从 UI 手动触发)。"""
+    ml = _get_mailer()
+    if not ml:
+        return jsonify({"ok": False, "error": "mailer.py 不可用"}), 500
+    result = ml.send_report()
+    status = 200 if result["ok"] else 500
+    return jsonify(result), status
+
+
 @app.route("/api/email/send", methods=["POST"])
 def email_send():
     """
@@ -798,7 +883,7 @@ def _scheduler_loop():
     print("[scheduler] 邮件调度线程已启动", flush=True)
     while True:
         try:
-            cfg = mailer.get_config()
+            cfg = mailer.get_config_full()
             if not cfg["enabled"]:
                 # 关闭, 每小时看一眼
                 time.sleep(3600)