brainstorm: Frontend Chinese UI

Goal

Make the existing JSP/Servlet frontend interface display in Simplified Chinese so users see Chinese page titles, navigation, labels, action buttons, empty states, accessibility labels, and server-rendered feedback messages.

What I already know

The user requested: "前端界面需要中文".
The project uses JSP/CSS rendered by Servlet/Tomcat, not a SPA framework.
Visible English text is concentrated in src/main/webapp/WEB-INF/jsp/**.
Some user-facing messages are set by Java controllers/services and rendered by JSP pages.
The application already uses UTF-8 JSP page encoding and a UTF-8 character encoding filter.

Assumptions

Use Simplified Chinese for all user-visible frontend copy.
Keep URLs, form field names, Java identifiers, enum codes, database values, CSS class names, and servlet names unchanged.
Translate dynamic display names exposed by Java enums/role helpers where they are shown in the UI.
Do not add a full i18n framework in this task.

Open Questions

None blocking; proceed with the Simplified Chinese assumption.

Requirements

Translate all hardcoded visible English text in JSP pages to Simplified Chinese.
Change HTML language attributes from English to Simplified Chinese where applicable.
Translate visible document titles and the web app display name.
Translate server-generated messages that are displayed to users on the frontend.
Preserve existing page structure, routing, permissions, form submission behavior, JSTL/EL bindings, and backend workflows.
Leave stored data and machine-readable codes unchanged.

Acceptance Criteria

Navigation, page headings, labels, buttons, table headers, empty states, option labels, and accessible labels appear in Simplified Chinese.
Login, unauthorized, dashboard, role home, catalog, management, reader, borrowing, report, system log, and admin user pages no longer show English UI copy except product/brand names and technical/user data.
Server-rendered success/error messages shown in the UI are Simplified Chinese.
Maven build succeeds.

Definition of Done

Tests or build verification run where practical.
Lint/typecheck/build green for the Java webapp.
Spec update considered after implementation.

Out of Scope

Runtime language switching.
Browser locale detection.
New translation resource bundles.
Database data migration.
Visual redesign beyond any minor layout-preserving text fit adjustments.

Technical Notes

Relevant spec index: .trellis/spec/frontend/index.md.
Backend messages may require .trellis/spec/backend/error-handling.md and .trellis/spec/backend/quality-guidelines.md.
Likely affected frontend files include src/main/webapp/WEB-INF/jsp/**, src/main/webapp/WEB-INF/web.xml, and possibly src/main/webapp/static/images/library-login.svg for accessible text.
Likely affected Java files include controllers/services/entities that expose user-facing display names or request messages.

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