refactor(core): drop per-terminal device labels

Remove sealLabel/openLabel and their label constants; devices are no
longer named per channel. Rename the create setting seats to
max_members and point the e2e join helper at POST /join.

packages/core/test/vectors.test.ts

@@ -182,30 +182,6 @@ describe('raw 帧', () => {
   });
 });
 
-describe('设备名', () => {
-  it('固定 IV 下的密文一致,并能解回', async () => {
-    const session = await openVectorSession();
-    for (const l of vectors.labels) {
-      const sealed = await session.sealLabel(l.name, { iv: h(l.iv) });
-      expect(toHex(sealed)).toBe(l.blob);
-      expect(sealed.length).toBeLessThanOrEqual(256);
-      expect(await session.openLabel(sealed, session.endpointHash)).toBe(l.name);
-    }
-  });
-
-  it('换一个终端的哈希就解不开(AAD 绑定终端)', async () => {
-    const session = await openVectorSession();
-    const sealed = await session.sealLabel('我的 iPhone');
-    await expect(session.openLabel(sealed, new Uint8Array(32))).rejects.toThrowError(IntegrityError);
-  });
-
-  it('超过 228 字节 UTF-8 时拒绝', async () => {
-    const session = await openVectorSession();
-    await expect(session.sealLabel('x'.repeat(229))).rejects.toThrow();
-    await expect(session.sealLabel('x'.repeat(228))).resolves.toHaveLength(256);
-  });
-});
-
 describe('链接', () => {
   it('合法链接解析结果与向量一致', () => {
     for (const v of vectors.links.valid) {