fix(channels): 逐平台对齐参考插件的模型目录（兜底表全量）

照参考 *-product.ts 的 FALLBACK_MODELS 逐项补齐，此前每个平台都只挑了
几个"看着像"的 id，属偷工减料：

- trae      7 → 28 可见 + 4 hidden（照 isHidden 语义单列 models_hidden，
            不污染用户可选列表：browser_use_subagent / explore_sub_agent_v13 /
            explore_sub_agent_v2 / summary 都是内部子 agent）
- lobsterai 3 → 19（远端 /api/models/available 须带 model_flag，否则少
            kimi-k3 —— 参考注释点名）
- opencode  3 → 14，并带 models_free（isFree 是官方语义：7 个 free 匿名可用）
- qoder     17 → 19（补 CN 独有的 q37fmodel / gm51model，均 1M 上下文）
- minimax   3 → 4（补 MiniMax-M2.7）

model_list 相应支持 models_hidden（不进可选列表）与 models_free（isFree 字段）
—— 此前 isFree 被硬编码为 false，把官方免费模型标成了付费。

对齐后与参考逐平台零差异（比对脚本结果）：trae / minimax / cline /
lobsterai / opencode / qoder / zcode / loomy / raccoon 全部一致。

internal/lua/plugins/channels.lua

@@ -125,9 +125,20 @@ local PLATFORMS = {
     hosts = { "www.trae.cn", "api.trae.com.cn", "api.trae.cn", "trae-api-cn.mchost.guru" },
     base_url = "https://trae-api-cn.mchost.guru",
     adapter = "openai",
+    -- 照参考 TRAE_FALLBACK_MODELS 全量（32 项）。其中 4 项带 isHidden
+    -- （内部子 agent）—— 不进用户可选列表，单列在 models_hidden。
     models = {
-      "DeepSeek-V4-Flash", "DeepSeek-V4-Pro", "kimi-k3", "kimi-k2.6",
-      "glm-5", "glm-5.2", "Doubao-Seed-2.1-Pro",
+      "DeepSeek-V4-Flash-Official", "Doubao-Seed-2.1-Pro", "seed-code-pro-0430",
+      "Doubao-Seed-2.1-Turbo", "Doubao-Seed-2.0-Code", "glm-5.2", "glm-5-turbo",
+      "glm-5", "DeepSeek-V4-Pro", "DeepSeek-V4-Flash", "kimi-k3", "kimi-k2.7-code",
+      "kimi-k2.6", "minimax-m3", "qwen-3.7-plus", "sagitta", "aquila",
+      "custom_model_gemini", "custom_model_placeholder", "custom_model_1M_text",
+      "custom_model_1M", "custom_model_kimi", "custom_model_claude",
+      "custom_model_gpt-5", "custom_model_no-fc", "custom_model_deepseek_chat",
+      "custom_model_deepseek_reasoner", "custom_model_deepseek_v4",
+    },
+    models_hidden = {
+      "browser_use_subagent", "explore_sub_agent_v13", "explore_sub_agent_v2", "summary",
     },
     -- 每日签到：POST /trae/api/v2/ug/checkin_credits/claim body {} 到 UG 主机。
     checkin = {
@@ -206,7 +217,9 @@ local PLATFORMS = {
       parse = "id_list",
     },
     adapter = "openai",
-    models = { "MiniMax-M3.1-Flash-Preview", "MiniMax-M3", "MiniMax-M2.7-highspeed" },
+    -- 照参考 MINIMAX_FALLBACK_MODELS（4 项）。远端权威：
+    -- GET /mavis/api/v1/models?region=cn&buildEnv=prod
+    models = { "MiniMax-M3.1-Flash-Preview", "MiniMax-M3", "MiniMax-M2.7-highspeed", "MiniMax-M2.7" },
     -- 每日签到（两步：状态预检 + 领取；幂等靠服务端状态）
     checkin = {
       url = "https://agent.minimax.cn/minimax-cloud/api/v1/signin/claim",
@@ -537,7 +550,17 @@ local PLATFORMS = {
       parse = "id_list",
     },
     adapter = "openai",
-    models = { "kimi-k3", "glm-5.2", "deepseek-v4-flash" },
+    -- 照参考 LOBSTERAI_FALLBACK_MODELS 全量（19 项）。远端权威：
+    -- GET /api/models/available（**必须带 model_flag 参数**，否则只返回 25 个
+    -- 且没有 kimi-k3 —— 参考注释点名）。
+    models = {
+      "deepseek-v4-flash", "deepseek-v4-pro", "MiniMax-M3", "MiniMax-M2.7",
+      "qwen3.7-max", "qwen3.7-plus", "qwen3.6-plus", "qwen3.5-plus-2026-04-20",
+      "kimi-k2.7-code", "kimi-k2.7-code-highspeed", "kimi-k2.6", "kimi-k2.5",
+      "doubao-seed-2-1-pro-260628", "doubao-seed-2-1-turbo-260628",
+      "doubao-seed-2-0-code-preview-260215", "glm-5.2", "glm-5.1",
+      "glm-5v-turbo", "glm-5",
+    },
     -- 余额（对齐参考：GET /api/user/profile-summary）
     balance = {
       url = "https://lobsterai-server.youdao.com/api/user/profile-summary",
@@ -563,7 +586,19 @@ local PLATFORMS = {
       parse = "id_list",
     },
     adapter = "openai",
-    models = { "big-pickle", "claude-sonnet-4-20250514", "gpt-5.1-codex-mini" },
+    -- 照参考 OPENCODE_FALLBACK_MODELS 全量（14 项）。isFree 是**官方语义
+    -- 字段**（匿名可用与否）：7 个 free 无需 key，其余需付费 key（实测匿名 401）。
+    models = {
+      "big-pickle", "space-bunny-free", "longcat-2.5-preview-free",
+      "mimo-v2.6-flash-free", "mimo-v2.5-free", "nemotron-3-ultra-free",
+      "nemotron-3.5-lightning-free", "deepseek-v4-flash", "deepseek-v4.1-flash",
+      "glm-5.2", "kimi-k2.5", "minimax-m2.7", "minimax-m3", "qwen3.8-max",
+    },
+    models_free = {
+      "big-pickle", "space-bunny-free", "longcat-2.5-preview-free",
+      "mimo-v2.6-flash-free", "mimo-v2.5-free", "nemotron-3-ultra-free",
+      "nemotron-3.5-lightning-free",
+    },
   },
 
   -- CodeArts（华为）—— 凭据 + SDK-HMAC-SHA256 签到（照参考 codearts-credits.ts）。
@@ -643,6 +678,9 @@ local PLATFORMS = {
       "qmodel_38max", "qfmodel", "qmodel_latest", "qmodel",
       "kmodel_latest", "kmodel", "gmodel", "gfmodel",
       "dmodel", "dfmodel", "mmodel",
+      -- CN 独有（参考注释点名：`q37fmodel` / `gm51model` 仅国区下发，
+      -- 两者都是 1M 上下文、支持图像与思考）
+      "q37fmodel", "gm51model",
     },
     -- 余额（对齐参考 qoder-credits.ts：GET /sash/api/v2/me/usage，余额=userQuota.remaining
     -- + addOnQuota.remaining，走 openApiBase）
@@ -5149,9 +5187,18 @@ function plugin.model_list(req)
   local plat = platformById(args and args.platform)
   if not plat then return { status = 400, json = { error = "未知平台" } } end
   local disabled = disabledModelsOf(plat.id)
+  -- models_hidden：内部子 agent（照参考 isHidden 语义）不进用户可选列表。
+  local hidden = {}
+  for _, m in ipairs(plat.models_hidden or {}) do hidden[m] = true end
+  -- models_free：参考的 isFree 字段（官方语义：匿名/免费可用）。
+  local free = {}
+  for _, m in ipairs(plat.models_free or {}) do free[m] = true end
   local out = {}
   for i, m in ipairs(effectiveModels(plat.id)) do
-    out[#out+1] = { id = m, name = m, disabled = disabled[m] and true or false, isFree = false }
+    if not hidden[m] then
+      out[#out+1] = { id = m, name = m, disabled = disabled[m] and true or false,
+                      isFree = free[m] and true or false }
+    end
   end
   local remote = plugin.state.remoteModels and plugin.state.remoteModels[plat.id]
   return { status = 200, json = {