feat: detect security hotspots in Soroban contracts

src/analysis/stellar/hotspots/hotspots-analyzer.ts

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+import { HotspotScore } from './types';
+
+export class HotspotsAnalyzer {
+  analyze(): HotspotScore[] {
+    // TODO: Score risky functions and detect security-sensitive code
+    return [];
+  }
+}

src/analysis/stellar/hotspots/index.ts

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+export * from './types';
+export * from './hotspots-analyzer';

src/analysis/stellar/hotspots/types.ts

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+export interface HotspotScore {
+  functionName: string;
+  score: number;
+  riskyPatterns: string[];
+}