Practice Kit Validation Schema Missing Common Fields

### Checks

- [x] I have searched [github.com/aws/amazon-q-developer-cli/issues](https://github.com/aws/amazon-q-developer-cli/issues?q=) and there are no duplicates of my issue
- [x] I have run `q doctor` in the affected terminal session
- [x] I have run `q restart` and replicated the issue again

### Operating system

Linux 6.16.3-76061603-generic - Pop!_OS 22.04 LTS

### Expected behaviour

Practice kit creation should support all necessary fields including gradeIds, duration, instructions, and features for complete practice kit setup

### Actual behaviour

Practice Kit validation schema doesn't include fields like gradeIds, duration, instructions, and features that are commonly needed for practice kit creation, causing validation failures

```
[chat-transcript]

[Tool uses: e

Let me create users directly in MongoDB and test participations:
[Tool uses: execute_bash]

Let me check if the User model is being imported in the controller:
[Tool uses: fs_read]

[Tool uses: fs_write]

[Tool uses: execute_bash]

[Tool uses: execute_bash]

[Tool uses: execute_bash]

[Tool uses: execute_bash]

[Tool uses: execute_bash]

[Tool uses: execute_bash]

[Tool uses: execute_bash]

[Tool uses: execute_bash]

[Tool uses: execute_bash]

[Tool uses: execute_bash]

[Tool uses: execute_bash]

[Tool uses: execute_bash]

[Tool uses: execute_bash]

## ✅ Participation Routes Status: **WORKING PROPERLY**

### **All Routes Tested Successfully:**

| Route | Method | Status | Description |
|-------|--------|--------|-------------|
| `/api/participations` | GET | ✅ Working | List all participations with filtering |
| `/api/participations` | POST | ✅ Working | Create new participation |
| `/api/participations/:id` | GET | ✅ Working | Get participation by ID |
| `/api/participations/:id` | PUT | ✅ Working | Update participation |
| `/api/participations/:id` | DELETE | ✅ Working | Soft delete participation |
| `/api/participations/competition/:id/participants` | GET | ✅ Working | Get participants for competition |

### **✅ Features Verified:**

1. **Registration:** Students can register for competitions
2. **Payment Tracking:** Supports pending/completed/failed payment status
3. **Duplicate Prevention:** Cannot register twice for same competition
4. **Competition Integration:** Properly references existing competitions
5. **Filtering:** Filter by competition, user, payment status
6. **Pagination:** Supports page/limit parameters
7. **Validation:** Proper ObjectId validation for competitionId/userId
8. **Soft Delete:** Deletion is recoverable

### **✅ Business Logic Working:**

- **Payment Flow:** pending → completed/failed
- **Registration Control:** One registration per user per competition
- **Competition Validation:** Only allows registration for existing competitions
- **Receipt Management:** Tracks payment references and receipt numbers

### **✅ Sample Data Created:**

- **Participation 1:** User registered for "National Math Competition" (Payment: Completed)
- **Participation 2:** User registered for "Advanced Math Challenge" (Deleted)

### **⚠️ Minor Issue Fixed:**

- **Missing User Model:** Created User model to support user population
- **Import Missing:** Added User import to participation controller

### **✅ API Responses:**

- **Success:** Proper JSON responses with populated competition details
- **Validation:** Clear error messages for invalid data
- **Business Rules:** Enforces duplicate prevention and competition validation

**The participation routes are fully functional and ready for student competition registrations!**
[Tool uses: none]

> Can you create and track these issues in the github

I'll create GitHub issues to track the problems we found during testing.
[Tool uses: report_issue]

[Tool uses: report_issue]

(...truncated)
```

### Steps to reproduce

1. Try to create practice kit with fields like gradeIds, duration, instructions, features
2. Validation fails because these fields are not in practiceKitCreateSchema
3. Only basic fields like title, description, examIds, price are supported

### Environment

```yaml

[q-details]
version = "1.15.0"
hash = "a8a0426eaff32ac9b1599ca1b1f1881ffd16054d"
date = "2025-09-02T17:17:19.458949Z (15d ago)"

[system-info]
chip = "Intel(R) Core(TM) i5-14400F"
total-cores = 10
memory = "31.13 GB"

[system-info.os.linux]
kernel_version = "6.16.3-76061603-generic"
id = "pop"
name = "Pop!_OS"
pretty_name = "Pop!_OS 22.04 LTS"
version_id = "22.04"
version = "22.04 LTS"

[environment]
cwd = "/home/USER/Projects/Abacus/calkulusApi"
cli-path = "/home/USER/Projects/Abacus/calkulusApi"
install-method = "unknown"

[env-vars]
DISPLAY = ":1"
GTK_IM_MODULE = "ibus"
PATH = "/home/USER/.nvm/versions/node/v22.19.0/bin:/home/USER/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/home/USER/.local/bin"
QTERM_SESSION_ID = "9cbd5779856542a594ef076bb41cad7b"
QT_IM_MODULE = "ibus"
Q_SET_PARENT_CHECK = "1"
Q_TERM = "1.15.0"
SHELL = "/bin/bash"
TERM = "xterm-256color"
XDG_CURRENT_DESKTOP = "pop:GNOME"
XDG_SESSION_DESKTOP = "pop"
XDG_SESSION_TYPE = "x11"
XMODIFIERS = "@im=ibus"

[chat-settings]

[chat-trusted_tools]
fs_read=trusted
execute_bash=trusted
fs_write=trusted

[chat-failed_request_ids]
none

[chat-context]
current_profile=q_cli_default
profile_context=
AmazonQ.md
README.md
.amazonq/rules/**/*.md

files=
/home/daniel/Projects/Abacus/calkulusApi/README.md, 750 tkns
total context size=750 tkns
```