fix: 修复19个Bug (P0-P3) — 持续性调试第7轮发现的问题

P0 (5): crypto/rand session ID, TTS fallback可达性, goroutine defer recover, adminAuth前缀修正
P1 (5): 普通用户密码验证, context传递, priority clamp, 超时重试, 自主思考速率限制
P2 (4): Briefing AI降级, 前端消息类型渲染, Docker Compose补全, PWA 192图标
P3 (5): goroutine错误处理, .gitignore完善, reminder created_at, voice Dockerfile, Go版本更新

backend/gateway/internal/handler/auth_handler.go

@@ -1,11 +1,15 @@
 package handler
 
 import (
+	"database/sql"
+	"fmt"
 	"net/http"
 	"strings"
 	"time"
 
 	"github.com/gin-gonic/gin"
+	_ "github.com/lib/pq"
+	"golang.org/x/crypto/bcrypt"
 
 	"github.com/yourname/cyrene-ai/gateway/internal/config"
 )
@@ -13,11 +17,12 @@ import (
 // AuthHandler 认证处理器
 type AuthHandler struct {
 	cfg *config.Config
+	db  *sql.DB
 }
 
 // NewAuthHandler 创建认证处理器
-func NewAuthHandler(cfg *config.Config) *AuthHandler {
-	return &AuthHandler{cfg: cfg}
+func NewAuthHandler(cfg *config.Config, db *sql.DB) *AuthHandler {
+	return &AuthHandler{cfg: cfg, db: db}
 }
 
 // Register 用户注册 (需要邮箱验证码、昵称必填)
@@ -96,7 +101,16 @@ func (h *AuthHandler) Login(c *gin.Context) {
 		}
 		userID = "admin_" + req.Username
 	} else {
-		// MVP阶段：普通用户登录 (简化逻辑，后续需要验证密码哈希)
+		// 普通用户登录：从数据库查询密码哈希并验证
+		authenticated, err := h.verifyUserPassword(req.Username, req.Password)
+		if err != nil {
+			c.JSON(http.StatusInternalServerError, gin.H{"error": "服务器内部错误"})
+			return
+		}
+		if !authenticated {
+			c.JSON(http.StatusUnauthorized, gin.H{"error": "用户名或密码错误"})
+			return
+		}
 		userID = "user_" + req.Username
 	}
 
@@ -113,6 +127,44 @@ func (h *AuthHandler) Login(c *gin.Context) {
 	})
 }
 
+// verifyUserPassword 验证普通用户的密码
+// 从数据库查询用户的密码哈希并与输入密码比对
+// 如果用户不存在，返回 (false, nil)；如果密码匹配，返回 (true, nil)
+func (h *AuthHandler) verifyUserPassword(username, password string) (bool, error) {
+	if h.db == nil {
+		// 数据库不可用时回退到简单验证（开发阶段兼容）
+		// 仅允许固定测试密码，不允许空密码登录
+		return password == "test123", nil
+	}
+
+	var storedHash string
+	err := h.db.QueryRow(
+		"SELECT password_hash FROM users WHERE username = $1",
+		username,
+	).Scan(&storedHash)
+
+	if err == sql.ErrNoRows {
+		// 用户不存在
+		return false, nil
+	}
+	if err != nil {
+		return false, fmt.Errorf("查询用户失败: %w", err)
+	}
+
+	// 使用 bcrypt 验证密码哈希
+	// 如果存储的是明文密码（向后兼容），则直接比对
+	if strings.HasPrefix(storedHash, "$2a$") || strings.HasPrefix(storedHash, "$2b$") || strings.HasPrefix(storedHash, "$2y$") {
+		// bcrypt 哈希
+		if err := bcrypt.CompareHashAndPassword([]byte(storedHash), []byte(password)); err != nil {
+			return false, nil
+		}
+		return true, nil
+	}
+
+	// 明文密码向后兼容（开发阶段）
+	return password == storedHash, nil
+}
+
 // RefreshToken 刷新令牌
 func (h *AuthHandler) RefreshToken(c *gin.Context) {
 	authHeader := c.GetHeader("Authorization")

backend/gateway/internal/handler/briefing_handler.go

@@ -221,6 +221,9 @@ func (h *BriefingHandler) GenerateDailyBriefing(userID string) (*store.Briefing,
 	if err != nil {
 		log.Printf("[briefing] AI 摘要生成失败 (降级): %v", err)
 		summary = h.buildFallbackSummary(briefing)
+		briefing.SummarySource = "fallback"
+	} else {
+		briefing.SummarySource = "ai"
 	}
 	briefing.Summary = summary
 

backend/gateway/internal/handler/session_handler.go

@@ -1,6 +1,7 @@
 package handler
 
 import (
+	"crypto/rand"
 	"encoding/json"
 	"fmt"
 	"log"
@@ -576,8 +577,15 @@ func (h *SessionHandler) exportTXT(c *gin.Context, session *store.Session, messa
 func randomID(n int) string {
 	const letters = "abcdefghijklmnopqrstuvwxyz0123456789"
 	b := make([]byte, n)
+	if _, err := rand.Read(b); err != nil {
+		// fallback to deterministic IDs only if crypto/rand fails
+		for i := range b {
+			b[i] = letters[i%len(letters)]
+		}
+		return string(b)
+	}
 	for i := range b {
-		b[i] = letters[i%len(letters)]
+		b[i] = letters[int(b[i])%len(letters)]
 	}
 	return string(b)
 }