fix(#48): add the missing version-local migration for syb_session

Adding SYBSession to migrations.Migrate was not enough. Schema reaches an
existing database only through a version-local file; with the previous
version already recorded in sys_migration, Migrate never re-ran and the
table simply never appeared. The unit tests build a fresh database every
time, so they stayed green while the real database was missing a table —
which surfaced as "Error 1146: Table 'goauto.syb_session' doesn't exist"
on the first import attempt.

server/.gitignore was hiding these files. go-admin ignores version-local
because it is where generated local migrations land, but every GoAuto
migration belongs in version control; the existing ones had been forced
in with `git add -f`. Un-ignoring *.go there also recovers four migrations
that were never committed at all — 1786700000000 through 1786700300000,
covering the base schema, device registration, heartbeat and collection
execution. A fresh clone could not have built a working database.

Guard the class of mistake rather than just this instance:

  - migrations.VerifyTables checks every model's table after migrating and
    names what is missing along with the fix.
  - The migrate command runs it, so the failure lands at migrate time
    instead of at the first request that needs the table.
  - initDB no longer discards migrateModel's error. Upstream had
    `_ = migrateModel()` followed by an unconditional "初始化成功", so a
    failed migration reported success and the launcher believed it.

Also records the two-step rule in Common-Changes: a new model needs both
the model registration and a new version file.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

server/.gitignore

@@ -14,8 +14,11 @@ config/settings.dev.*.yml.log
 temp/logs
 config/settings.dev.yml.log
 config/settings.b.dev.yml
+# go-admin 默认忽略这个目录（它原本放本地生成的迁移）。GoAuto 的迁移全部要
+# 跟踪：漏提交一个版本文件，别人的数据库就少一张表，而且要到运行时才炸。
+# 之前的版本文件是靠 git add -f 进来的，这条否定规则让它不再需要。
 cmd/migrate/migration/version-local/*
-!cmd/migrate/migration/version-local/doc.go
+!cmd/migrate/migration/version-local/*.go
 
 config/settings.deva.yml
 go-admin-server