feat(server/membership): add ai_points plan policy fields

Introduces ai_points_monthly and ai_point_base_chars on the membership
plan policy, exposes them through TenantPlanAccess and MembershipInfo,
and seeds Pro with a 1500-point monthly allowance across the local,
server, and deploy configs.

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

server/internal/tenant/app/auth_service.go

@@ -71,6 +71,8 @@ type MembershipInfo struct {
 	EndAt                  *string `json:"end_at"`
 	ArticleGenerationLimit int     `json:"article_generation_limit"`
 	ArticleQuotaCycle      string  `json:"article_quota_cycle"`
+	AIPointsMonthly        int     `json:"ai_points_monthly"`
+	AIPointBaseChars       int     `json:"ai_point_base_chars"`
 	CompanyLimit           int     `json:"company_limit"`
 	ImageStorageBytes      int64   `json:"image_storage_bytes"`
 	ContactAdminOnExpiry   bool    `json:"contact_admin_on_expiry"`
@@ -271,6 +273,8 @@ func (s *AuthService) loadMembershipInfo(ctx context.Context, tenantID int64) (*
 		EndAt:                  formatTimeValuePtr(access.EndAt),
 		ArticleGenerationLimit: access.ArticleGenerationLimit(),
 		ArticleQuotaCycle:      access.ArticleQuotaCycle(),
+		AIPointsMonthly:        access.AIPointsMonthlyLimit(),
+		AIPointBaseChars:       access.AIPointBaseChars(),
 		CompanyLimit:           access.BrandLimit(),
 		ImageStorageBytes:      access.ImageStorageBytes(),
 		ContactAdminOnExpiry:   access.Policy.ContactAdminOnExpiry,