String attribute size enforcement is inconsistent — small sizes validated, larger sizes (4096) are not

### 👟 Reproduction steps **Environment:** - `appwrite/appwrite:latest` (1.9.0) - MariaDB 10.11 - Redis (no auth) - Database worker (`worker-databases` command) - Env vars: `_APP_OPTIONS_ABUSE=disabled`, `_APP_OPTIONS_FORCE_HTTPS=disabled`, `_APP_DOMAIN=appwrite` **Setup:** Bootstrap an Appwrite instance with an admin account, project, and API key with database scopes: 1. Register an admin account via `POST /v1/account` (project: `console`) 2. Create admin session, team, and project 3. Create an API key with scopes: `databases.read`, `databases.write`, `collections.read`, `collections.write`, `documents.read`, `documents.write` 4. Create a database via `POST /v1/databases` 5. Create a collection with open permissions (`read("any")`, `create("any")`, `update("any")`, `delete("any")`) 6. Create three string attributes in the same collection: - `key: small`, `size: 128`, `required: false` - `key: medium`, `size: 256`, `required: false` - `key: large`, `size: 4096`, `required: false` 7. Wait for the database worker to process attributes (they transition from `processing` to `available`) **Control — content within limits:** ``` POST /v1/databases/{dbId}/collections/{collectionId}/documents Content-Type: application/json X-Appwrite-Project: {projectId} X-Appwrite-Key: {apiKey} { "documentId": "unique()", "data": { "small": "short text", "medium": "medium length text here", "large": "some content for the large field" } } ``` Returns 201. All three fields accept content within their limits. **Exceed size 128 (correctly rejected):** Insert a document with 150 characters in the `small` field. Returns **400** — correctly rejected. **Exceed size 256 (correctly rejected):** Insert a document with 300 characters in the `medium` field. Returns **400** — correctly rejected. **Exceed size 4096 (incorrectly accepted):** ``` POST /v1/databases/{dbId}/collections/{collectionId}/documents Content-Type: application/json X-Appwrite-Project: {projectId} X-Appwrit…