feat(desktop): P15 开局职业选择页——新档四选一+暂不选择，接入 v3 存档与当日任务

- MenuState：新增 OccupationSelect 页与 StartNewGameWith 命令；occupationOptions=农夫/渔夫/货郎/书生/暂不选择，
  默认高亮「暂不选择」= 不写职业的旧行为；四选一确认后发 StartNewGameWith，ESC 返回主菜单（既有 MainMenu
  行为与测试不变）。
- WorldBootstrap.occupationStateFor/refreshOccupationToday：按 seed+职业种子生成/跨日刷新当日 Offered 任务。
- Game：主菜单「开始新游戏」→ 职业选择页；选定后 initialWorldWithOccupation 注入 Money/Energy 与 Today，
  m5View.Task 随之写入 v3 存档；游玩中按日刷新；autoplay/flow 默认走「暂不选择」保持旧演示行为；DrawMenu 渲染职业页。
- 测试 Desktop 93（新增 6）：职业页选项顺序/默认 None/标签、确认命令与返回、bootstrap 四职业 Money/Energy+当日池内
  Offered 任务、四职业 v3 round-trip（职业+任务逐字段）、T 面板显示所选职业的模板名与「待接受」、跨日刷新保持同日。

1 files changed, 17 insertions, 0 deletions

diff --git a/src/LivingVillage.Desktop/WorldBootstrap.fs b/src/LivingVillage.Desktop/WorldBootstrap.fs
index 0e8ea30..f8ba775 100644
--- a/src/LivingVillage.Desktop/WorldBootstrap.fs
+++ b/src/LivingVillage.Desktop/WorldBootstrap.fs
@@ -18,6 +18,23 @@ module WorldBootstrap =
 
     let private daylightStartTick = 6L * Sim.ticksPerDay / 24L
 
+    /// 新档职业状态：按世界 seed 与职业种子生成 nowTick 所属日的 Offered 任务（design §3）。
+    let occupationStateFor (seed: uint64) (kind: Occupation.Kind) (nowTick: int64) : Occupation.State =
+        let baseState = Occupation.stateOf kind
+        { baseState with
+            Today = Occupation.dailyTaskOf seed (Occupation.occupationSeedOf kind) (Occupation.dayIndexOf nowTick) kind }
+
+    /// 跨日刷新当日任务；同日（含 Done/Failed 终态）原样保留。
+    let refreshOccupationToday (seed: uint64) (state: Occupation.State) (nowTick: int64) : Occupation.State =
+        { state with
+            Today =
+                Occupation.refreshToday
+                    seed
+                    (Occupation.occupationSeedOf state.Profile.Kind)
+                    state.Profile.Kind
+                    nowTick
+                    state.Today }
+
     let initialWorldWithOccupation (startAtDaylight: bool) (seed: uint64) (count: int) (occupation: Occupation.State option) : World =
         if count < 0 || count > npcSpawnTiles.Length then
             invalidArg (nameof count) "Desktop bootstrap supports at most 30 NPCs."