refactor: 简化模型管理，移除启用/禁用，优化测试和布局

- 移除供应商/模型启用禁用能力，清理DB schema/migration/API/前端
- 供应商测试改为Base URL连通性+/models探测
- 新增POST /api/models/test模型连接测试
- 新增GET /api/providers/options专用供应商选项接口
- 统一工具栏为ModelsToolbar，参考项目管理布局
- 模型弹窗优化：默认能力、响应式3列标签、并排数值
- 前后端正整数校验、供应商下拉loading/error/empty状态
- 表格列宽统一，操作列/名称列固定宽度

src/server/db/models.ts

@@ -36,7 +36,6 @@ export function createModel(
         capabilities: JSON.stringify(capabilities),
         contextLength: request.contextLength ?? null,
         createdAt: now,
-        enabled: true,
         id,
         maxOutputTokens: request.maxOutputTokens ?? null,
         modelId,
@@ -66,32 +65,6 @@ export function deleteModel(raw: Database, id: string): { error: string; status:
   return { success: true };
 }
 
-export function disableModel(raw: Database, id: string): { error: string; status: number } | { model: Model } {
-  const db = wrap(raw);
-  const existing = db.select().from(models).where(eq(models.id, id)).get();
-  if (!existing) return { error: "模型不存在", status: 404 };
-  if (!existing.enabled) return { error: "模型已禁用", status: 409 };
-
-  const now = new Date().toISOString();
-  db.update(models).set({ enabled: false, updatedAt: now }).where(eq(models.id, id)).run();
-
-  const updated = db.select().from(models).where(eq(models.id, id)).get();
-  return { model: toModel(updated!) };
-}
-
-export function enableModel(raw: Database, id: string): { error: string; status: number } | { model: Model } {
-  const db = wrap(raw);
-  const existing = db.select().from(models).where(eq(models.id, id)).get();
-  if (!existing) return { error: "模型不存在", status: 404 };
-  if (existing.enabled) return { error: "模型已启用", status: 409 };
-
-  const now = new Date().toISOString();
-  db.update(models).set({ enabled: true, updatedAt: now }).where(eq(models.id, id)).run();
-
-  const updated = db.select().from(models).where(eq(models.id, id)).get();
-  return { model: toModel(updated!) };
-}
-
 export function getModel(raw: Database, id: string): { error: string; status: number } | { model: Model } {
   const db = wrap(raw);
   const row = db.select().from(models).where(eq(models.id, id)).get();
@@ -222,7 +195,6 @@ function toModel(row: typeof models.$inferSelect): Model {
     capabilities: JSON.parse(row.capabilities) as ModelCapability[],
     contextLength: row.contextLength,
     createdAt: row.createdAt,
-    enabled: row.enabled,
     id: row.id,
     maxOutputTokens: row.maxOutputTokens,
     modelId: row.modelId,