fix(db): resolve migration bugs preventing fresh database initialization

- Fix composite primary keys in role_permissions and user_roles tables
  (PostgreSQL does not allow multiple PRIMARY KEY constraints)
- Fix FK table name mismatch: tasks → tokens (was wf_tokens)
- Fix FK table name mismatch: messages → message_templates (was message_templates_ref)
- Fix tenant table name in main.rs SQL: tenant (not tenants)
- Fix React Router nested routes: add /* wildcard for child route matching

crates/erp-server/migration/src/m20260412_000021_create_tasks.rs

@@ -108,7 +108,7 @@ impl MigrationTrait for Migration {
                 ForeignKey::create()
                     .name("fk_tasks_token")
                     .from(Tasks::Table, Tasks::TokenId)
-                    .to(WfTokens::Table, WfTokens::Id)
+                    .to(Tokens::Table, Tokens::Id)
                     .to_owned(),
             )
             .await?;
@@ -154,7 +154,7 @@ enum ProcessInstances {
 }
 
 #[derive(DeriveIden)]
-enum WfTokens {
+enum Tokens {
     Table,
     Id,
 }