fix(analysis): fix API field mismatch and enable full game analysis

Map raw backend response (evaluation/continuationMoves) to frontend
model (eval/winChance/continuations). Add getFenHistory() call after
loading a game or PGN so runAnalysis() gets per-ply FEN history and
triggers analyzeGame() instead of falling back to single-position
analysis. Remove !hasAnnotations guard so positionAnalysis card shows
even when a game is loaded.

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

src/app/models/analysis.models.ts

@@ -3,11 +3,21 @@ export interface AnalysisRequest {
   depth: number;
 }
 
+export interface RawAnalysisResponse {
+  fen: string;
+  evaluation: number;
+  depth: number;
+  bestMove: string;
+  mate: number | null;
+  continuationMoves: string[];
+}
+
 export interface AnalysisResponse {
   eval: number;
   winChance: number;
   depth: number;
   bestMove: string;
+  mate: number | null;
   continuations: string[];
 }