📦 refactor: Consolidate DB models, encapsulating Mongoose usage in data-schemas (#11830)

* chore: move database model methods to /packages/data-schemas

* chore: add TypeScript ESLint rule to warn on unused variables

* refactor: model imports to streamline access

- Consolidated model imports across various files to improve code organization and reduce redundancy.
- Updated imports for models such as Assistant, Message, Conversation, and others to a unified import path.
- Adjusted middleware and service files to reflect the new import structure, ensuring functionality remains intact.
- Enhanced test files to align with the new import paths, maintaining test coverage and integrity.

* chore: migrate database models to packages/data-schemas and refactor all direct Mongoose Model usage outside of data-schemas

* test: update agent model mocks in unit tests

- Added `getAgent` mock to `client.test.js` to enhance test coverage for agent-related functionality.
- Removed redundant `getAgent` and `getAgents` mocks from `openai.spec.js` and `responses.unit.spec.js` to streamline test setup and reduce duplication.
- Ensured consistency in agent mock implementations across test files.

* fix: update types in data-schemas

* refactor: enhance type definitions in transaction and spending methods

- Updated type definitions in `checkBalance.ts` to use specific request and response types.
- Refined `spendTokens.ts` to utilize a new `SpendTxData` interface for better clarity and type safety.
- Improved transaction handling in `transaction.ts` by introducing `TransactionResult` and `TxData` interfaces, ensuring consistent data structures across methods.
- Adjusted unit tests in `transaction.spec.ts` to accommodate new type definitions and enhance robustness.

* refactor: streamline model imports and enhance code organization

- Consolidated model imports across various controllers and services to a unified import path, improving code clarity and reducing redundancy.
- Updated multiple files to reflect the new import structure, ensuring all functionalities remain intact.
- Enhanced overall code organization by removing duplicate import statements and optimizing the usage of model methods.

* feat: implement loadAddedAgent and refactor agent loading logic

- Introduced `loadAddedAgent` function to handle loading agents from added conversations, supporting multi-convo parallel execution.
- Created a new `load.ts` file to encapsulate agent loading functionalities, including `loadEphemeralAgent` and `loadAgent`.
- Updated the `index.ts` file to export the new `load` module instead of the deprecated `loadAgent`.
- Enhanced type definitions and improved error handling in the agent loading process.
- Adjusted unit tests to reflect changes in the agent loading structure and ensure comprehensive coverage.

* refactor: enhance balance handling with new update interface

- Introduced `IBalanceUpdate` interface to streamline balance update operations across the codebase.
- Updated `upsertBalanceFields` method signatures in `balance.ts`, `transaction.ts`, and related tests to utilize the new interface for improved type safety.
- Adjusted type imports in `balance.spec.ts` to include `IBalanceUpdate`, ensuring consistency in balance management functionalities.
- Enhanced overall code clarity and maintainability by refining type definitions related to balance operations.

* feat: add unit tests for loadAgent functionality and enhance agent loading logic

- Introduced comprehensive unit tests for the `loadAgent` function, covering various scenarios including null and empty agent IDs, loading of ephemeral agents, and permission checks.
- Enhanced the `initializeClient` function by moving `getConvoFiles` to the correct position in the database method exports, ensuring proper functionality.
- Improved test coverage for agent loading, including handling of non-existent agents and user permissions.

* chore: reorder memory method exports for consistency

- Moved `deleteAllUserMemories` to the correct position in the exported memory methods, ensuring a consistent and logical order of method exports in `memory.ts`.

packages/api/src/auth/invite.ts

@@ -0,0 +1,61 @@
+import { Types } from 'mongoose';
+import { logger, hashToken, getRandomValues } from '@librechat/data-schemas';
+
+export interface InviteDeps {
+  createToken: (data: {
+    userId: Types.ObjectId;
+    email: string;
+    token: string;
+    createdAt: number;
+    expiresIn: number;
+  }) => Promise<unknown>;
+  findToken: (filter: { token: string; email: string }) => Promise<unknown>;
+}
+
+/** Creates a new user invite and returns the encoded token. */
+export async function createInvite(
+  email: string,
+  deps: InviteDeps,
+): Promise<string | { message: string }> {
+  try {
+    const token = await getRandomValues(32);
+    const hash = await hashToken(token);
+    const encodedToken = encodeURIComponent(token);
+    const fakeUserId = new Types.ObjectId();
+
+    await deps.createToken({
+      userId: fakeUserId,
+      email,
+      token: hash,
+      createdAt: Date.now(),
+      expiresIn: 604800,
+    });
+
+    return encodedToken;
+  } catch (error) {
+    logger.error('[createInvite] Error creating invite', error);
+    return { message: 'Error creating invite' };
+  }
+}
+
+/** Retrieves and validates a user invite by encoded token and email. */
+export async function getInvite(
+  encodedToken: string,
+  email: string,
+  deps: InviteDeps,
+): Promise<unknown> {
+  try {
+    const token = decodeURIComponent(encodedToken);
+    const hash = await hashToken(token);
+    const invite = await deps.findToken({ token: hash, email });
+
+    if (!invite) {
+      throw new Error('Invite not found or email does not match');
+    }
+
+    return invite;
+  } catch (error) {
+    logger.error('[getInvite] Error getting invite:', error);
+    return { error: true, message: (error as Error).message };
+  }
+}