docs: add v0.2.8 changelog (2026-04-20)

Summarizes recent releases (v0.2.7 → v0.2.8) on the landing page
Change Log in both en and zh.

apps/web/features/landing/i18n/en.ts

@@ -282,6 +282,22 @@ export const en: LandingDict = {
       fixes: "Bug Fixes",
     },
     entries: [
+      {
+        version: "0.2.8",
+        date: "2026-04-20",
+        title: "Per-Agent Models, Kimi Runtime & Self-Host Auth",
+        changes: [],
+        features: [
+          "Per-agent `model` field with a provider-aware dropdown — pick the LLM model for each agent from the UI or via `multica agent create/update --model`, with live discovery from each runtime's CLI",
+          "Kimi CLI as a new agent runtime (Moonshot AI's `kimi-cli` over ACP), with model selection, auto-approved tool permissions, and streaming tool-call rendering",
+          "Expand toggle on inline comment and reply editors for composing long text",
+        ],
+        fixes: [
+          "Posting the result comment is now an explicit, numbered step in agent workflows so final replies reach the issue instead of terminal output",
+          "Agent live status card no longer leaks across issues when switching via Cmd+K",
+          "Self-hosted session cookies honor the `FRONTEND_ORIGIN` scheme — plain-HTTP deployments stop silently dropping cookies, and `COOKIE_DOMAIN=<ip>` now falls back to host-only with a warning instead of breaking login",
+        ],
+      },
       {
         version: "0.2.7",
         date: "2026-04-18",

apps/web/features/landing/i18n/zh.ts

@@ -282,6 +282,22 @@ export const zh: LandingDict = {
       fixes: "问题修复",
     },
     entries: [
+      {
+        version: "0.2.8",
+        date: "2026-04-20",
+        title: "Agent 模型选择、Kimi Runtime 与自部署登录",
+        changes: [],
+        features: [
+          "Agent 新增 `model` 字段及按 Provider 聚合的模型下拉框——可在界面或通过 `multica agent create/update --model` 为每个 Agent 选择 LLM 模型，并从各 Runtime CLI 实时发现可用模型",
+          "新增 Kimi CLI Agent Runtime（Moonshot AI 的 `kimi-cli`，基于 ACP），支持模型选择、自动授权工具权限以及流式工具调用渲染",
+          "评论和回复编辑器新增放大按钮，便于撰写长文本",
+        ],
+        fixes: [
+          "Agent 工作流将“发布结果评论”提升为独立的显式步骤，确保最终回复送达 Issue 而不是只留在终端输出",
+          "通过 Cmd+K 切换 Issue 时不再出现其他 Issue 的 Agent 实时状态残留",
+          "自部署会话 Cookie 的 Secure 标志改由 `FRONTEND_ORIGIN` 协议决定——HTTP 部署不再因浏览器丢弃 Cookie 导致登录失败；`COOKIE_DOMAIN=<ip>` 会自动回退到 host-only 并输出警告",
+        ],
+      },
       {
         version: "0.2.7",
         date: "2026-04-18",