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/pages/analysis/analysis.component.html

@@ -246,7 +246,7 @@
       <!-- Side column -->
       <aside class="side">
         <!-- Single position analysis result -->
-        @if (positionAnalysis && !hasAnnotations) {
+        @if (positionAnalysis) {
           <details class="side-card" open>
             <summary class="side-card-summary">
               <span class="side-card-title">Position Analysis</span>