feat(/admin): add /admin command for admin management

- Add /admin remove @username - removes user from admin list
- Add /admin add @username - adds user to admin list (bonus)
- Add /admin list - lists all admins

Resolves #52

apps/telegram-bot/bot.py

@@ -8,6 +8,7 @@ from telegram.ext import Application, CommandHandler, MessageHandler, filters
 
 from commands import (
     cmd_add,
+    cmd_admin,
     cmd_bounty,
     cmd_delete,
     cmd_edit,
@@ -41,6 +42,7 @@ def build_app() -> Application:
     app.add_handler(CommandHandler("delete", cmd_delete))
     app.add_handler(CommandHandler("track", cmd_track))
     app.add_handler(CommandHandler("untrack", cmd_untrack))
+    app.add_handler(CommandHandler("admin", cmd_admin))
 
     app.add_handler(MessageHandler(filters.COMMAND, cmd_help))
 
@@ -56,6 +58,7 @@ async def post_init(app: Application) -> None:
             ("edit", "Edit a bounty"),
             ("track", "Track a bounty"),
             ("untrack", "Stop tracking"),
+            ("admin", "Admin management"),
             ("help", "Show help"),
         ]
     )

apps/telegram-bot/commands.py

@@ -291,6 +291,101 @@ async def cmd_untrack(update: Update, ctx: ContextTypes.DEFAULT_TYPE) -> None:
         await update.message.reply_text("Not tracking bounty #{bounty_id}.")
 
 
+async def cmd_admin(update: Update, ctx: ContextTypes.DEFAULT_TYPE) -> None:
+    args = extract_args(update.message.text)
+    if not args:
+        await update.message.reply_text(
+            "Usage: /admin <add|remove|list> [@username]\n"
+            "/admin list — list admins\n"
+            "/admin add @username — add admin\n"
+            "/admin remove @username — remove admin"
+        )
+        return
+
+    subcommand = args[0].lower()
+    username = args[1] if len(args) > 1 else None
+
+    requesting_user_id = get_user_id(update)
+    room_id = get_room_id(update)
+
+    if subcommand == "list":
+        admins = BOUNTY_SERVICE.list_admins(room_id)
+        if not admins:
+            await update.message.reply_text("No admins in this room.")
+            return
+        admin_mentions = " ".join(f"admin_id:{uid}" for uid in admins)
+        await update.message.reply_text(f"Admins: {admin_mentions}")
+        return
+
+    if subcommand == "remove":
+        if not username:
+            await update.message.reply_text("Usage: /admin remove @username")
+            return
+
+        if not username.startswith("@"):
+            await update.message.reply_text(
+                f"⛔ {username} is not a valid username (must start with @)."
+            )
+            return
+
+        target_username = username[1:]
+        try:
+            chat = await ctx.bot.get_chat(target_username)
+            target_user_id = chat.id
+        except Exception:
+            await update.message.reply_text(
+                f"⛔ Could not find user @{target_username}."
+            )
+            return
+
+        try:
+            BOUNTY_SERVICE.remove_admin(room_id, target_user_id, requesting_user_id)
+            await update.message.reply_text(
+                f"✅ @{target_username} is no longer an admin."
+            )
+        except PermissionError as e:
+            await update.message.reply_text(f"⛔ {e}")
+        except ValueError:
+            await update.message.reply_text(f"⛔ @{target_username} is not an admin.")
+        return
+
+    if subcommand == "add":
+        if not username:
+            await update.message.reply_text("Usage: /admin add @username")
+            return
+
+        if not username.startswith("@"):
+            await update.message.reply_text(
+                f"⛔ {username} is not a valid username (must start with @)."
+            )
+            return
+
+        target_username = username[1:]
+        try:
+            chat = await ctx.bot.get_chat(target_username)
+            target_user_id = chat.id
+        except Exception:
+            await update.message.reply_text(
+                f"⛔ Could not find user @{target_username}."
+            )
+            return
+
+        try:
+            BOUNTY_SERVICE.add_admin(room_id, target_user_id, requesting_user_id)
+            await update.message.reply_text(f"✅ @{target_username} is now an admin.")
+        except PermissionError as e:
+            await update.message.reply_text(f"⛔ {e}")
+        except ValueError:
+            await update.message.reply_text(
+                f"⛔ @{target_username} is already an admin."
+            )
+        return
+
+    await update.message.reply_text(
+        "Unknown subcommand. Use: /admin <add|remove|list> [@username]"
+    )
+
+
 async def cmd_start(update: Update, ctx: ContextTypes.DEFAULT_TYPE) -> None:
     if is_group(update):
         await update.message.reply_text(