feat(auth,prompt-rule): add password change with session revocation and scope prompt rules by brand

Add self-service password change that re-hashes the credential and bumps a
per-user session version so all existing access/refresh tokens are rejected.
Session version is tracked in Redis with an in-memory fallback and enforced in
middleware and refresh.

Scope prompt rules and rule groups to a brand: new brand_id column (migrated to
a "未归属" fallback brand for existing rows), brand-filtered queries/indexes, and
brand-aware admin-web tabs.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

server/internal/shared/auth/claims.go

@@ -9,5 +9,6 @@ type Claims struct {
 	TenantID           int64  `json:"tenant_id"`
 	PrimaryWorkspaceID int64  `json:"primary_workspace_id"`
 	Role               string `json:"role"`
+	SessionVersion     int64  `json:"session_version,omitempty"`
 	jwt.RegisteredClaims
 }