feat: enhance habitat appearances and item relations

Replace item tags with favorite things to unify entity tagging
Allow multiple maps, times, and weathers per habitat appearance
Make item usage optional and translate API error messages to Chinese
Add .dockerignore files for backend and frontend

frontend/src/services/api.ts

@@ -48,7 +48,7 @@ export interface Item {
   id: number;
   name: string;
   category: NamedEntity;
-  usage: NamedEntity;
+  usage: NamedEntity | null;
   customization: {
     dyeable: boolean;
     dualDyeable: boolean;
@@ -91,7 +91,6 @@ export type ConfigType =
   | 'item-categories'
   | 'item-usages'
   | 'acquisition-methods'
-  | 'item-tags'
   | 'maps';
 
 export interface PokemonPayload {
@@ -105,7 +104,7 @@ export interface PokemonPayload {
 export interface ItemPayload {
   name: string;
   categoryId: number;
-  usageId: number;
+  usageId: number | null;
   recipeId: number | null;
   dyeable: boolean;
   dualDyeable: boolean;
@@ -125,9 +124,9 @@ export interface HabitatPayload {
   recipeItems: Array<{ itemId: number; quantity: number }>;
   pokemonAppearances: Array<{
     pokemonId: number;
-    mapId: number;
-    timeOfDay: string;
-    weather: string;
+    mapIds: number[];
+    timeOfDays: string[];
+    weathers: string[];
     rarity: number;
   }>;
 }
@@ -145,11 +144,24 @@ export function buildQuery(params: Record<string, string | number | undefined>):
   return query ? `?${query}` : '';
 }
 
+async function getErrorMessage(response: Response): Promise<string> {
+  try {
+    const data = (await response.json()) as { message?: unknown };
+    if (typeof data.message === 'string' && data.message.trim() !== '') {
+      return data.message;
+    }
+  } catch {
+    // Ignore invalid or empty error bodies and use the status fallback.
+  }
+
+  return `请求失败（${response.status}）`;
+}
+
 async function getJson<T>(path: string): Promise<T> {
   const response = await fetch(`${apiBaseUrl}${path}`);
 
   if (!response.ok) {
-    throw new Error(`Request failed with ${response.status}`);
+    throw new Error(await getErrorMessage(response));
   }
 
   return response.json() as Promise<T>;
@@ -165,7 +177,7 @@ async function sendJson<T>(path: string, method: 'POST' | 'PUT', body: unknown):
   });
 
   if (!response.ok) {
-    throw new Error(`Request failed with ${response.status}`);
+    throw new Error(await getErrorMessage(response));
   }
 
   return response.json() as Promise<T>;
@@ -177,7 +189,7 @@ async function deleteJson(path: string): Promise<void> {
   });
 
   if (!response.ok) {
-    throw new Error(`Request failed with ${response.status}`);
+    throw new Error(await getErrorMessage(response));
   }
 }