Add admin status check endpoint to guild routes

Introduced `/guilds/members/{guildId}/{userId}/admin` endpoint to determine if a guild member is an admin. Added `AdminStatusResponse` DTO and documented the new route with OpenAPI annotations. This feature allows for efficient admin status verification with fallback to REST fetch on cache miss.

src/main/java/me/bobert/netneutrality/http/server/GuildRoutes.java

@@ -19,6 +19,7 @@ import io.javalin.openapi.OpenApiRequestBody;
 import io.javalin.openapi.OpenApiResponse;
 import me.bobert.netneutrality.db.service.GuildService;
 import me.bobert.netneutrality.db.service.GuildServiceProvider;
+import me.bobert.netneutrality.http.server.dto.AdminStatusResponse;
 import me.bobert.netneutrality.http.server.dto.ChannelSummaryResponse;
 import me.bobert.netneutrality.http.server.dto.ErrorResponse;
 import me.bobert.netneutrality.http.server.dto.GuildBooleanUpdateRequest;
@@ -31,6 +32,7 @@ import me.bobert.netneutrality.http.server.dto.MemberSummaryResponse;
 import me.bobert.netneutrality.http.server.dto.OwnerResponse;
 import me.bobert.netneutrality.http.server.dto.RoleSummaryResponse;
 import me.bobert.netneutrality.http.server.dto.VoiceChannelSummaryResponse;
+import me.bobert.netneutrality.utils.UserFunction;
 import net.dv8tion.jda.api.JDA;
 import net.dv8tion.jda.api.entities.Guild;
 import net.dv8tion.jda.api.entities.Member;
@@ -59,6 +61,7 @@ public final class GuildRoutes {
         routes.get("/guilds/roles/{guildId}", ctx -> roles(jdaSupplier, ctx));
         routes.get("/guilds/members/{guildId}/{userId}", ctx -> member(jdaSupplier, ctx));
         routes.get("/guilds/members/{guildId}/{userId}/roles", ctx -> memberRoles(jdaSupplier, ctx));
+        routes.get("/guilds/members/{guildId}/{userId}/admin", ctx -> memberAdmin(jdaSupplier, ctx));
         routes.get("/guilds/voice-channels/{guildId}", ctx -> voiceChannels(jdaSupplier, ctx));
         routes.get("/guilds/voice-channels/{guildId}/{channelId}", ctx -> voiceChannel(jdaSupplier, ctx));
         routes.get("/guilds/config/{guildId}", ctx -> config(jdaSupplier, guildServices, ctx));
@@ -235,6 +238,38 @@ public final class GuildRoutes {
         );
     }
 
+    @OpenApi(
+        path = "/guilds/members/{guildId}/{userId}/admin",
+        methods = HttpMethod.GET,
+        summary = "Check whether a guild member is an admin of the guild, falling back to a REST fetch on a member cache miss",
+        tags = {"Guilds"},
+        pathParams = {
+            @io.javalin.openapi.OpenApiParam(name = "guildId", description = "The Discord guild id"),
+            @io.javalin.openapi.OpenApiParam(name = "userId", description = "The Discord user id")
+        },
+        responses = {
+            @OpenApiResponse(status = "200", content = @OpenApiContent(from = AdminStatusResponse.class)),
+            @OpenApiResponse(status = "404", content = @OpenApiContent(from = ErrorResponse.class))
+        }
+    )
+    private static void memberAdmin(Supplier<JDA> jdaSupplier, Context ctx) {
+        Guild guild = guild(jdaSupplier, ctx);
+        String userId = ctx.pathParam("userId");
+
+        CacheOrFetch.<Member>resolve(
+            ctx,
+            () -> guild.getMemberById(userId),
+            () -> guild.retrieveMemberById(userId),
+            member -> {
+                Map<String, Object> summary = new LinkedHashMap<>();
+                summary.put("guild_id", guild.getId());
+                summary.put("user_id", member.getId());
+                summary.put("is_admin", UserFunction.isAdmin(member));
+                return summary;
+            }
+        );
+    }
+
     /**
      * Builds the {@code /guilds/members/{guildId}/{userId}} response for a resolved member.
      */

src/main/java/me/bobert/netneutrality/http/server/dto/AdminStatusResponse.java

@@ -0,0 +1,17 @@
+package me.bobert.netneutrality.http.server.dto;
+
+/*
+ * Copyright (c) anthorob
+ *
+ * https://discord.gg/qUa6zNFZsd
+ */
+
+/**
+ * OpenAPI schema for the {@code /guilds/members/{guildId}/{userId}/admin} response.
+ */
+public record AdminStatusResponse(
+    String guildId,
+    String userId,
+    boolean isAdmin
+) {
+}