Add UNO addbot, fix audit issues, add fishing to superstats, update README

UNO addbot:
- !uno addbot / !uno removebot for lobby bot management (WinBee, GwinBee)
- Bots ante from community pot, increasing the total pot
- Single human can start a game if bots fill remaining slots
- Per-bot display names throughout (replaces global unoBotName)

Audit fixes:
- Lobby display now always shows both humans and bots (was omitting bots on join)
- Slot check accounts for bots (was only counting humans)
- Color Roulette bot victim name fixed (was showing acting bot's name)
- Lobby display built under lock to prevent stale reads
- Bot name list separated from env var to prevent duplicates
- Extracted shared buildLobbyDisplay helper
- Inlined unnecessary nameOf closure in sudden death

Other:
- T5 masterwork drop rate reduced from 1.5% to 0.5%
- Added fishing stats to !superstatsexplusalpha
- Updated README with all new features

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

internal/plugin/uno.go

@@ -415,7 +415,7 @@ func (p *UnoPlugin) Name() string { return "uno" }
 
 func (p *UnoPlugin) Commands() []CommandDef {
 	return []CommandDef{
-		{Name: "uno", Description: "Solo or multiplayer Uno", Usage: "!uno [nomercy [7-0]] €amount | !uno start [nomercy [7-0]] €amount | !uno join | !uno go", Category: "Games"},
+		{Name: "uno", Description: "Solo or multiplayer Uno", Usage: "!uno [nomercy [7-0]] €amount | !uno start [nomercy [7-0]] €amount | !uno join | !uno addbot | !uno removebot | !uno go | !uno leave | !uno cancel", Category: "Games"},
 		{Name: "uno_pot", Description: "Show the community pot balance", Usage: "!uno_pot", Category: "Games"},
 	}
 }
@@ -447,6 +447,10 @@ func (p *UnoPlugin) OnMessage(ctx MessageContext) error {
 			return p.handleMultiLeave(ctx)
 		case lower == "cancel":
 			return p.handleMultiCancel(ctx)
+		case lower == "addbot":
+			return p.handleMultiAddBot(ctx)
+		case lower == "removebot":
+			return p.handleMultiRemoveBot(ctx)
 		}
 
 		// Solo challenge: !uno [nomercy [7-0]] €amount