feat(server): pro 套餐设备上限 5 → 3

- seed(sqlite/mysql 000007)+ 001_init:pro max_devices 5→3(全新库直接对)
- 新增迁移 000019(sqlite/mysql,up/down):UPDATE plans SET max_devices=3
  WHERE code='pro' —— 已迁移的线上库靠它更新;down 回退 5
- 000002/001 注释同步(free 1 / pro 3 / team 10)
- 测试:sqlite_migrate 期望版本 18→19;devices 集成测试 pro 断言 5→3
- free(1)/team(10)不变

注:设备上限当前仍未强制执行(登录注册 MaxDevices=0),仅数据/展示口径;
真正启用+超限 UX 见 todo #16。

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

server/internal/devices/devices_integration_test.go

@@ -172,15 +172,15 @@ func TestFullChain(t *testing.T) {
 	ctx := context.Background()
 
 	userID := createUser(t, db, "chain@example.com", "active")
-	// 7-day pro trial → effective plan pro (max 5).
+	// 7-day pro trial → effective plan pro (max 3).
 	giveSubscription(t, db, userID, "pro", "trial", time.Now().UTC().Add(7*24*time.Hour))
 
 	plan, apiErr := svc.ResolvePlan(ctx, userID)
 	if apiErr != nil {
 		t.Fatalf("ResolvePlan: %v", apiErr)
 	}
-	if plan.PlanCode != "pro" || plan.MaxDevices != 5 {
-		t.Fatalf("want pro/5, got %s/%d", plan.PlanCode, plan.MaxDevices)
+	if plan.PlanCode != "pro" || plan.MaxDevices != 3 {
+		t.Fatalf("want pro/3, got %s/%d", plan.PlanCode, plan.MaxDevices)
 	}
 
 	devUUID := newUUID(t, db)

server/internal/store/sqlite_migrate_test.go

@@ -29,8 +29,8 @@ func TestSQLiteMigrateUpDown(t *testing.T) {
 	if dirty {
 		t.Fatalf("schema dirty after MigrateUp")
 	}
-	if v != 18 {
-		t.Errorf("version = %d, want 18", v)
+	if v != 19 {
+		t.Errorf("version = %d, want 19", v)
 	}
 
 	// 2. Core tables exist.

server/migrations/001_init.sql

@@ -25,14 +25,14 @@ CREATE TABLE IF NOT EXISTS users (
 CREATE TABLE IF NOT EXISTS plans (
   id            BIGINT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
   code          ENUM('free','pro','team') NOT NULL UNIQUE,
-  max_devices   INT  NOT NULL,              -- free 1 / pro 5 / team 10
+  max_devices   INT  NOT NULL,              -- free 1 / pro 3 / team 10
   daily_minutes INT  NULL,                  -- free 10; NULL = unlimited
   ad_gate       BOOLEAN NOT NULL DEFAULT FALSE  -- free users must watch an ad daily
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
 
 INSERT IGNORE INTO plans (code, max_devices, daily_minutes, ad_gate) VALUES
   ('free', 1,  10,   TRUE),
-  ('pro',  5,  NULL, FALSE),
+  ('pro',  3,  NULL, FALSE),
   ('team', 10, NULL, FALSE);
 
 -- -------------------------------------------------------------------------

server/migrations/mysql/000002_plans_subscriptions.up.sql

@@ -2,7 +2,7 @@
 CREATE TABLE plans (
   id            BIGINT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
   code          ENUM('free','pro','team') NOT NULL UNIQUE,
-  max_devices   INT NOT NULL,                      -- free 1 / pro 5 / team 10
+  max_devices   INT NOT NULL,                      -- free 1 / pro 3 / team 10
   daily_minutes INT NULL,                          -- free 10；NULL = 不限
   ad_gate       BOOLEAN NOT NULL DEFAULT FALSE     -- free 每日看广告解锁
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

server/migrations/mysql/000007_seed.up.sql

@@ -1,11 +1,11 @@
 -- plans seed（口径来源：design/CLAUDE.md §7，价格不入表）
 -- free: 1 设备，10 分钟/天，每日广告解锁
--- pro:  5 设备，不限时长，无广告门槛
+-- pro:  3 设备，不限时长，无广告门槛
 -- team: 10 设备，不限时长，无广告门槛
 INSERT INTO plans (code, max_devices, daily_minutes, ad_gate)
 VALUES
   ('free', 1,  10,   TRUE),
-  ('pro',  5,  NULL, FALSE),
+  ('pro',  3,  NULL, FALSE),
   ('team', 10, NULL, FALSE)
 ON DUPLICATE KEY UPDATE
   max_devices   = VALUES(max_devices),

server/migrations/mysql/000019_pro_max_devices_3.down.sql

@@ -0,0 +1,2 @@
+-- 回退:pro 套餐设备上限 3 → 5。
+UPDATE plans SET max_devices = 5 WHERE code = 'pro';

server/migrations/mysql/000019_pro_max_devices_3.up.sql

@@ -0,0 +1,2 @@
+-- pro 套餐设备上限 5 → 3(已迁移库更新;新库由 000007_seed 直接 seed 为 3)。
+UPDATE plans SET max_devices = 3 WHERE code = 'pro';

server/migrations/sqlite/000007_seed.up.sql

@@ -1,7 +1,7 @@
 -- plans seed（free/pro/team）
 INSERT INTO plans (code, max_devices, daily_minutes, ad_gate) VALUES
   ('free', 1,  10,   1),
-  ('pro',  5,  NULL, 0),
+  ('pro',  3,  NULL, 0),
   ('team', 10, NULL, 0)
 ON CONFLICT(code) DO UPDATE SET
   max_devices   = excluded.max_devices,

server/migrations/sqlite/000019_pro_max_devices_3.down.sql

@@ -0,0 +1,2 @@
+-- 回退:pro 套餐设备上限 3 → 5。
+UPDATE plans SET max_devices = 5 WHERE code = 'pro';

server/migrations/sqlite/000019_pro_max_devices_3.up.sql

@@ -0,0 +1,2 @@
+-- pro 套餐设备上限 5 → 3(已迁移库更新;新库由 000007_seed 直接 seed 为 3)。
+UPDATE plans SET max_devices = 3 WHERE code = 'pro';