fix(number-fields): избегаем потери точности длинных чисел

- number-поля теперь рендерятся как text + inputMode=numeric,
  чтобы браузер не округлял значения через input type=number
- пробелы при вставке в number-поля удаляются
- бэкенд нормализует значения number-полей в строку перед сохранением
- добавлен хелпер normalizeFieldValueForStorage

Closes: искажение расчётного счёта и других длинных числовых полей

server/finance/overrides.ts

@@ -0,0 +1,43 @@
+import { type Express } from "express";
+import { query } from "./db-client";
+import { authenticateToken, requirePermission, type AuthenticatedRequest } from "../middleware/auth.middleware";
+
+export function registerOverrideRoutes(app: Express): void {
+  // GET /api/overrides?type=income|expense
+  app.get("/api/overrides", authenticateToken, requirePermission('finance.manage'), async (req: AuthenticatedRequest, res) => {
+    try {
+      const type = req.query.type as string;
+      const table = type === "expense" ? "expense_category_overrides" : "income_category_overrides";
+      const result = await query(`SELECT record_id, category_id, created_at FROM "${table}"`);
+      res.json({ success: true, overrides: result.rows });
+    } catch (err: any) {
+      res.status(500).json({ success: false, error: err.message });
+    }
+  });
+
+  // POST /api/overrides
+  app.post("/api/overrides", authenticateToken, requirePermission('finance.manage'), async (req: AuthenticatedRequest, res) => {
+    try {
+      const { type, recordId, categoryId } = req.body;
+      const table = type === "expense" ? "expense_category_overrides" : "income_category_overrides";
+      await query(
+        `INSERT INTO "${table}" (record_id, category_id) VALUES ($1, $2) ON CONFLICT (record_id) DO UPDATE SET category_id = EXCLUDED.category_id`,
+        [recordId, categoryId]
+      );
+      res.json({ success: true });
+    } catch (err: any) {
+      res.status(500).json({ success: false, error: err.message });
+    }
+  });
+
+  // DELETE /api/overrides/:type/:recordId
+  app.delete("/api/overrides/:type/:recordId", authenticateToken, requirePermission('finance.manage'), async (req: AuthenticatedRequest, res) => {
+    try {
+      const table = req.params.type === "expense" ? "expense_category_overrides" : "income_category_overrides";
+      await query(`DELETE FROM "${table}" WHERE record_id = $1`, [req.params.recordId]);
+      res.json({ success: true });
+    } catch (err: any) {
+      res.status(500).json({ success: false, error: err.message });
+    }
+  });
+}