feat: display unlock conditions on all locked items

All locked items now show players exactly what they need to do next:
- Adventurers: "📜 Complete: [Quest Name]"
- Upgrades: "⚔️ Defeat: [Boss]" or "📜 Complete: [Quest]"
- Equipment (boss drops): "⚔️ Drop: [Boss Name]" instead of generic label
- Bosses: "⚔️ Defeat: [Previous Boss] first" or zone gate boss
- Quests: "📜 Complete: [Prerequisite Quest]"

Also wires adventurer unlocks through quests (militia through dragon_rider
had no unlock path), retroactively applies rewards on existing saves,
syncs boss reward arrays from defaults on load, and removes invalid
rune_stone reference from Forest Giant.

apps/api/src/routes/game.ts

@@ -61,7 +61,7 @@ gameRouter.get("/load", async (context) => {
     }
   }
 
-  // Backfill equipmentRewards on bosses that predate the field
+  // Backfill equipmentRewards on bosses that predate the field (will be synced below after defaults load)
   for (const boss of state.bosses) {
     if (!Array.isArray(boss.equipmentRewards)) {
       boss.equipmentRewards = [];
@@ -82,7 +82,7 @@ gameRouter.get("/load", async (context) => {
     }
   }
 
-  // Sync zoneId on quests to match current defaults
+  // Sync zoneId and rewards on quests to match current defaults
   for (const quest of state.quests) {
     const defaults = DEFAULT_QUESTS.find((d) => d.id === quest.id);
     if (defaults && quest.zoneId !== defaults.zoneId) {
@@ -93,6 +93,23 @@ gameRouter.get("/load", async (context) => {
       quest.zoneId = defaults?.zoneId ?? "verdant_vale";
       needsBackfill = true;
     }
+    // Sync rewards to match defaults so newly-added rewards take effect
+    if (defaults && JSON.stringify(quest.rewards) !== JSON.stringify(defaults.rewards)) {
+      quest.rewards = structuredClone(defaults.rewards);
+      needsBackfill = true;
+    }
+    // Retroactively apply adventurer unlocks from already-completed quests
+    if (quest.status === "completed") {
+      for (const reward of quest.rewards) {
+        if (reward.type === "adventurer" && reward.targetId) {
+          const adventurer = state.adventurers.find((a) => a.id === reward.targetId);
+          if (adventurer && !adventurer.unlocked) {
+            adventurer.unlocked = true;
+            needsBackfill = true;
+          }
+        }
+      }
+    }
   }
 
   for (const defaultUpgrade of DEFAULT_UPGRADES) {
@@ -149,13 +166,24 @@ gameRouter.get("/load", async (context) => {
     }
   }
 
-  // Backfill zoneId on bosses that predate the field
+  // Backfill zoneId and sync rewards on bosses to match current defaults
   for (const boss of state.bosses) {
+    const defaults = DEFAULT_BOSSES.find((d) => d.id === boss.id);
     if (!boss.zoneId) {
-      const defaults = DEFAULT_BOSSES.find((d) => d.id === boss.id);
       boss.zoneId = defaults?.zoneId ?? "verdant_vale";
       needsBackfill = true;
     }
+    // Sync equipmentRewards and upgradeRewards to match defaults
+    if (defaults) {
+      if (JSON.stringify(boss.equipmentRewards) !== JSON.stringify(defaults.equipmentRewards)) {
+        boss.equipmentRewards = structuredClone(defaults.equipmentRewards);
+        needsBackfill = true;
+      }
+      if (JSON.stringify(boss.upgradeRewards) !== JSON.stringify(defaults.upgradeRewards)) {
+        boss.upgradeRewards = structuredClone(defaults.upgradeRewards);
+        needsBackfill = true;
+      }
+    }
   }
 
   // Merge new bosses from defaults (new zones' bosses)