fix(cma): T4 residual bugs - predict 500 + reports restateDiffClass (cma-t4-residual-bugs-20260916)

B1: /api/cma/dashboard/predict hand-rolled threshold parsing called float() on the whole

expression -> ValueError on multi-clause thresholds like '<=36|>=124' -> 500. Now routes

through app.utils.threshold_parser.eval_threshold (single source of truth; red then yellow,

invalid/blank expr -> False, no crash).

B2: ReportCenter.vue restatement tab template called restateDiffClass while the script

defines restatementDiffClass (name mismatch since ec6af75) -> TypeError on render.

Verified: predict 200 on new code vs 500 on live code; /reports A/B browser run shows 0 vs 3

occurrences of the TypeError; pytest 1113 passed / 1 xfailed; vite build OK.

frontend/src/views/ReportCenter.vue

@@ -396,7 +396,7 @@
             </el-table-column>
             <el-table-column label="差异" width="140" align="right">
               <template #default="{ row }">
-                <span v-if="row.difference != null" :class="restateDiffClass(row.difference)">
+                <span v-if="row.difference != null" :class="restatementDiffClass(row.difference)">
                   {{ row.difference > 0 ? '+' : '' }}{{ formatMoney(row.difference) }}
                 </span>
                 <span v-else-if="row.needs_adjustment" class="restate-new-badge">新</span>