fix(#196): fix race condition in job status updates

Implemented optimistic locking with version field and SELECT FOR UPDATE
transactions to prevent data corruption from concurrent job status updates.

Changes:
- Added version field to RunnerJob schema for optimistic locking
- Created migration 20260202_add_runner_job_version_for_concurrency
- Implemented ConcurrentUpdateException for conflict detection
- Updated RunnerJobsService methods with optimistic locking:
  * updateStatus() - with version checking and retry logic
  * updateProgress() - with version checking and retry logic
  * cancel() - with version checking and retry logic
- Updated CoordinatorIntegrationService with SELECT FOR UPDATE:
  * updateJobStatus() - transaction with row locking
  * completeJob() - transaction with row locking
  * failJob() - transaction with row locking
  * updateJobProgress() - optimistic locking
- Added retry mechanism (3 attempts) with exponential backoff
- Added comprehensive concurrency tests (10 tests, all passing)
- Updated existing test mocks to support updateMany

Test Results:
- All 10 concurrency tests passing ✓
- Tests cover concurrent status updates, progress updates, completions,
  cancellations, retry logic, and exponential backoff

This fix prevents race conditions that could cause:
- Lost job results (double completion)
- Lost progress updates
- Invalid status transitions
- Data corruption under concurrent access

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

apps/api/src/auth/auth.service.ts

@@ -17,14 +17,19 @@ export class AuthService {
   /**
    * Get BetterAuth instance
    */
-  getAuth() {
+  getAuth(): Auth {
     return this.auth;
   }
 
   /**
    * Get user by ID
    */
-  async getUserById(userId: string) {
+  async getUserById(userId: string): Promise<{
+    id: string;
+    email: string;
+    name: string;
+    authProviderId: string | null;
+  } | null> {
     return this.prisma.user.findUnique({
       where: { id: userId },
       select: {
@@ -39,7 +44,12 @@ export class AuthService {
   /**
    * Get user by email
    */
-  async getUserByEmail(email: string) {
+  async getUserByEmail(email: string): Promise<{
+    id: string;
+    email: string;
+    name: string;
+    authProviderId: string | null;
+  } | null> {
     return this.prisma.user.findUnique({
       where: { email },
       select: {