fix: update outdated server unit tests

- auto-mode-service-planning.test.ts: Add taskExecutionPrompts argument
  to buildFeaturePrompt calls, update test for implementation instructions
- claude-usage-service.test.ts: Skip deprecated Mac tests (service now
  uses PTY for all platforms), rename Windows tests to PTY tests, update
  to use process.cwd() instead of home directory
- claude-provider.test.ts: Add missing model parameter to environment
  variable passthrough tests

All tests now pass (1093 passed, 23 skipped).

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

apps/server/tests/unit/providers/claude-provider.test.ts

@@ -286,6 +286,7 @@ describe('claude-provider.ts', () => {
 
       const generator = provider.executeQuery({
         prompt: 'Test',
+        model: 'claude-opus-4-5-20251101',
         cwd: '/test',
       });
 
@@ -312,6 +313,7 @@ describe('claude-provider.ts', () => {
 
       const generator = provider.executeQuery({
         prompt: 'Test',
+        model: 'claude-opus-4-5-20251101',
         cwd: '/test',
       });
 
@@ -339,6 +341,7 @@ describe('claude-provider.ts', () => {
 
       const generator = provider.executeQuery({
         prompt: 'Test',
+        model: 'claude-opus-4-5-20251101',
         cwd: '/test',
       });