feat(会员): 模型列表返回可用与不可用分桶

- shared-contracts 新增 llm_catalog.rs：LlmModelsResponse/LlmModelSummary/LlmUnavailableModel/LlmModelUnavailableReason（plan_required/disabled/unknown），未停用优先于档位的 disabled 语义留给域层
- AgcAgentMode/AgcModelProtocol 从 module-runtime 迁入 shared-contracts（前后端 + ts-rs 单一真源），module-runtime re-export 保持路径可用
- 整个目录 DTO 与枚举走 ts-rs，生成到 packages/shared/src/contracts/generated，revision 标 number
- module-runtime 新增 AgcModelCatalog::unavailable_models_for(access)：保持目录顺序，停用优先于档位不足，补单测
- api-server public_model_catalog 产出 models + unavailableModels 两桶，重写 model_catalog_tests

packages/shared/src/contracts/generated/AgcAgentMode.ts

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+// This file was generated by [ts-rs](https://github.com/Aleph-Alpha/ts-rs). Do not edit this file manually.
+
+/**
+ * 客户端启动的执行器。与线协议正交。
+ */
+export type AgcAgentMode = "codex" | "cc";

packages/shared/src/contracts/generated/AgcModelProtocol.ts

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+// This file was generated by [ts-rs](https://github.com/Aleph-Alpha/ts-rs). Do not edit this file manually.
+
+/**
+ * 上游线协议，与执行器正交。
+ *
+ * `openai_responses` / `openai_chat` 走 `/api/llm/v1/responses` 与
+ * `/api/llm/v1/chat/completions`；`anthropic` 走独立的
+ * `/api/llm/anthropic/{*path}`。
+ */
+export type AgcModelProtocol = "openai_responses" | "openai_chat" | "anthropic";

packages/shared/src/contracts/generated/LlmModelSummary.ts

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+// This file was generated by [ts-rs](https://github.com/Aleph-Alpha/ts-rs). Do not edit this file manually.
+import type { AgcAgentMode } from "./AgcAgentMode";
+import type { AgcModelProtocol } from "./AgcModelProtocol";
+
+/**
+ * 本档可用的一条模型摘要。不包含上游真实模型名。
+ */
+export type LlmModelSummary = { displayName: string, id: string, 
+/**
+ * 执行器；旧服务端缺字段时按 `codex` 兼容。
+ */
+agentMode: AgcAgentMode, 
+/**
+ * 上游线协议；旧服务端缺字段时按 `openai_responses` 兼容。
+ */
+protocol: AgcModelProtocol, };

packages/shared/src/contracts/generated/LlmModelUnavailableReason.ts

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+// This file was generated by [ts-rs](https://github.com/Aleph-Alpha/ts-rs). Do not edit this file manually.
+
+/**
+ * 模型对当前账号不可用的原因。
+ *
+ * `Unknown` 是前向兜底：后端将来新增取值时旧客户端不会解析失败。
+ */
+export type LlmModelUnavailableReason = "plan_required" | "disabled" | "unknown";

packages/shared/src/contracts/generated/LlmModelsResponse.ts

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+// This file was generated by [ts-rs](https://github.com/Aleph-Alpha/ts-rs). Do not edit this file manually.
+import type { LlmModelSummary } from "./LlmModelSummary";
+import type { LlmUnavailableModel } from "./LlmUnavailableModel";
+
+/**
+ * `GET /api/llm/models` 的响应。
+ */
+export type LlmModelsResponse = { defaultModelId: string, 
+/**
+ * 本档可用，保持目录顺序。
+ */
+models: Array<LlmModelSummary>, 
+/**
+ * 目录里其余全部，保持目录顺序；旧服务端缺字段时为空。
+ */
+unavailableModels: Array<LlmUnavailableModel>, 
+/**
+ * 模型目录版本；ts-rs 默认把 `u64` 映射成 `bigint`，前端消费 `number`。
+ */
+revision: number, };

packages/shared/src/contracts/generated/LlmUnavailableModel.ts

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+// This file was generated by [ts-rs](https://github.com/Aleph-Alpha/ts-rs). Do not edit this file manually.
+import type { AgcAgentMode } from "./AgcAgentMode";
+import type { AgcModelProtocol } from "./AgcModelProtocol";
+import type { LlmModelUnavailableReason } from "./LlmModelUnavailableReason";
+
+/**
+ * 目录里存在、但当前账号不可用的一条模型。字段与 [`LlmModelSummary`] 对齐，另带原因。
+ */
+export type LlmUnavailableModel = { displayName: string, id: string, agentMode: AgcAgentMode, protocol: AgcModelProtocol, reason: LlmModelUnavailableReason, };