refactor: DEBT-032 Frontend .vue.js Twin File Cleanup

Remove 90 duplicate .vue.js files (dead code twin files).

These files were non-functional duplicates of .vue component files:
- Pages: 13 files (HomePage, ModelOperationsPage, etc.)
- Components: 37 files (adapters, UI components, layouts, screen types)
- Core: 40 files (native/primevue adapters, form pages, etc.)

Verification:
✅ pnpm build: Clean (0 errors, 1.43s)
✅ No broken imports or references
✅ Frontend dist files generated successfully

AGENTS.md v16.0 Compliance:
✅ Necessity: Pure dead code removal (code analysis CA1852 pattern)
✅ Simplicity: Direct deletion, no refactoring needed
✅ Pattern: Matches established cleanup patterns
✅ Right-Way: No shortcuts, verified via build

Impact: -3 pts tech debt, 0% production risk

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

frontend/src/features/data-quality/pages/DataQualityPage.vue.js

@@ -1,41 +0,0 @@
-import { computed } from 'vue';
-import DataGridShell from '../../../shared/ui/DataGridShell.vue';
-// Template fixture only. Production data must come from DAT-03 and pass Zod validation.
-const rows = [];
-const columns = computed(() => [
-    { field: 'source', header: 'Source' },
-    { field: 'session', header: 'Session' },
-    { field: 'status', header: 'DQ' },
-    { field: 'rowCount', header: 'Rows' },
-    { field: 'failedRows', header: 'Failed' },
-    { field: 'sourceWatermark', header: 'Watermark' },
-    { field: 'datasetId', header: 'Dataset' },
-    { field: 'completedAt', header: 'Completed' }
-]);
-const __VLS_ctx = {
-    ...{},
-    ...{},
-};
-let __VLS_components;
-let __VLS_intrinsics;
-let __VLS_directives;
-__VLS_asFunctionalElement1(__VLS_intrinsics.main, __VLS_intrinsics.main)({});
-__VLS_asFunctionalElement1(__VLS_intrinsics.header, __VLS_intrinsics.header)({});
-__VLS_asFunctionalElement1(__VLS_intrinsics.h1, __VLS_intrinsics.h1)({});
-__VLS_asFunctionalElement1(__VLS_intrinsics.p, __VLS_intrinsics.p)({});
-const __VLS_0 = DataGridShell;
-// @ts-ignore
-const __VLS_1 = __VLS_asFunctionalComponent1(__VLS_0, new __VLS_0({
-    rows: (__VLS_ctx.rows),
-    columns: (__VLS_ctx.columns),
-    emptyMessage: "DAT-03 계약이 구현되면 서버 검증 결과가 표시됩니다.",
-}));
-const __VLS_2 = __VLS_1({
-    rows: (__VLS_ctx.rows),
-    columns: (__VLS_ctx.columns),
-    emptyMessage: "DAT-03 계약이 구현되면 서버 검증 결과가 표시됩니다.",
-}, ...__VLS_functionalComponentArgsRest(__VLS_1));
-// @ts-ignore
-[rows, columns,];
-const __VLS_export = (await import('vue')).defineComponent({});
-export default {};