Abstimmung Ja/Nein statt Links/Rechts

Modus-Werte yes/no statt left/right in DB, API und Statistik; Knöpfe
"Ja"/"Nein". Bestehende Stimmen müssen per SQL migriert werden.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TiXsPUqw7oeomZ8wZrQW5q

frontend/src/types.ts

@@ -26,12 +26,12 @@ export interface Thread {
   replies: Entry[];
 }
 
-export type VoteMode = "left" | "right";
+export type VoteMode = "yes" | "no";
 
 export interface VoteTally {
   pid: number;
-  left: number;
-  right: number;
+  yes: number;
+  no: number;
   selected: VoteMode | "none";
 }
 
@@ -65,7 +65,7 @@ export interface StatsDetail {
   entries: number;
   toplevel: number;
   replies: number;
-  votes: { left: number; right: number };
+  votes: { yes: number; no: number };
   impressions_total: number;
   visitors_total: number;
   daily: { day: string; impressions: number; visitors: number }[];