🪢 chore: Consolidate Pricing and Tx Imports After tx.js Module Removal (#12086)

* 🧹 chore: resolve imports due to rebase

* chore: Update model mocks in unit tests for consistency

- Consolidated model mock implementations across various test files to streamline setup and reduce redundancy.
- Removed duplicate mock definitions for `getMultiplier` and `getCacheMultiplier`, ensuring a unified approach in `recordCollectedUsage.spec.js`, `openai.spec.js`, `responses.unit.spec.js`, and `abortMiddleware.spec.js`.
- Enhanced clarity and maintainability of test files by aligning mock structures with the latest model updates.

* fix: Safeguard token credit checks in transaction tests

- Updated assertions in `transaction.spec.ts` to handle potential null values for `updatedBalance` by using optional chaining.
- Enhanced robustness of tests related to token credit calculations, ensuring they correctly account for scenarios where the balance may not be found.

* chore: transaction methods with bulk insert functionality

- Introduced `bulkInsertTransactions` method in `transaction.ts` to facilitate batch insertion of transaction documents.
- Updated test file `transactions.bulk-parity.spec.ts` to utilize new pricing function assignments and handle potential null values in calculations, improving test robustness.
- Refactored pricing function initialization for clarity and consistency.

* refactor: Enhance type definitions and introduce new utility functions for model matching

- Added `findMatchingPattern` and `matchModelName` utility functions to improve model name matching logic in transaction methods.
- Updated type definitions for `findMatchingPattern` to accept a more specific tokensMap structure, enhancing type safety.
- Refactored `dbMethods` initialization in `transactions.bulk-parity.spec.ts` to include the new utility functions, improving test clarity and functionality.

* refactor: Update database method imports and enhance transaction handling

- Refactored `abortMiddleware.js` to utilize centralized database methods for message handling and conversation retrieval, improving code consistency.
- Enhanced `bulkInsertTransactions` in `transaction.ts` to handle empty document arrays gracefully and added error logging for better debugging.
- Updated type definitions in `transactions.ts` to enforce stricter typing for token types, enhancing type safety across transaction methods.
- Improved test setup in `transactions.bulk-parity.spec.ts` by refining pricing function assignments and ensuring robust handling of potential null values.

* refactor: Update database method references and improve transaction multiplier handling

- Refactored `client.js` to update database method references for `bulkInsertTransactions` and `updateBalance`, ensuring consistency in method usage.
- Enhanced transaction multiplier calculations in `transaction.spec.ts` to provide fallback values for write and read multipliers, improving robustness in cost calculations across structured token spending tests.

api/server/controllers/agents/responses.js

@@ -36,7 +36,6 @@ const {
 } = require('~/server/controllers/agents/callbacks');
 const { loadAgentTools, loadToolsForExecution } = require('~/server/services/ToolService');
 const { findAccessibleResources } = require('~/server/services/PermissionService');
-const { getMultiplier, getCacheMultiplier } = require('~/models/tx');
 const db = require('~/models');
 
 /** @type {import('@librechat/api').AppConfig | null} */
@@ -514,7 +513,7 @@ const createResponse = async (req, res) => {
         {
           spendTokens: db.spendTokens,
           spendStructuredTokens: db.spendStructuredTokens,
-          pricing: { getMultiplier, getCacheMultiplier },
+          pricing: { getMultiplier: db.getMultiplier, getCacheMultiplier: db.getCacheMultiplier },
           bulkWriteOps: { insertMany: db.bulkInsertTransactions, updateBalance: db.updateBalance },
         },
         {
@@ -668,7 +667,7 @@ const createResponse = async (req, res) => {
         {
           spendTokens: db.spendTokens,
           spendStructuredTokens: db.spendStructuredTokens,
-          pricing: { getMultiplier, getCacheMultiplier },
+          pricing: { getMultiplier: db.getMultiplier, getCacheMultiplier: db.getCacheMultiplier },
           bulkWriteOps: { insertMany: db.bulkInsertTransactions, updateBalance: db.updateBalance },
         },
         {