Fix .gitignore and add missing authentication source files

This commit fixes overly broad .gitignore patterns that were excluding
important source code files from version control. Previously, wildcard
patterns like *auth*, *token*, *secret*, *connection*, and *credential*
were excluding ALL files containing these words, including critical
application code.

Changes:
- Updated .gitignore with specific patterns for sensitive config files
  (*.json, *.txt, *.yml, *.yaml extensions only)
- Removed broad wildcards that excluded source code files

Added missing source files:
- shared/auth/ (9 files): Complete authentication system
  - JWT handler, middleware, auth service, models, routes
- reports-app/backend/app/routers/auth.py: Authentication API router
- reports-app/backend/app/auth_middleware_wrapper.py: Middleware wrapper
- reports-app/frontend/src/stores/auth.js: Vue.js auth store
- reports-app/frontend/tests/: E2E tests and fixtures for auth
- reports-app/telegram-bot/app/auth/: Telegram auth linking module
- deployment/windows/scripts/Setup-ClaudeAuth.ps1: Windows deployment script
- security/secrets_scanner.py: Security scanning utility

These files are essential for the application to function and should
have been included in the initial commit.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

reports-app/frontend/tests/fixtures/auth.js

@@ -0,0 +1,60 @@
+export const testCredentials = {
+  valid: {
+    username: 'testuser',
+    password: 'testpass123'
+  },
+  invalid: {
+    username: 'wronguser',
+    password: 'wrongpass'
+  },
+  empty: {
+    username: '',
+    password: ''
+  },
+  partialValid: {
+    username: 'testuser',
+    password: ''
+  }
+};
+
+export const expectedMessages = {
+  loginSuccess: 'Conectare reușită',
+  loginError: 'Eroare de conectare',
+  usernameRequired: 'Numele de utilizator este obligatoriu',
+  passwordRequired: 'Parola este obligatorie',
+  invalidCredentials: 'Date de conectare incorecte'
+};
+
+export const apiEndpoints = {
+  login: '/api/auth/login',
+  logout: '/api/auth/logout',
+  refresh: '/api/auth/refresh',
+  user: '/api/auth/user'
+};
+
+export const mockApiResponses = {
+  loginSuccess: {
+    status: 200,
+    body: {
+      access_token: 'mock_access_token',
+      refresh_token: 'mock_refresh_token',
+      user: {
+        id: 1,
+        username: 'testuser',
+        full_name: 'Test User'
+      }
+    }
+  },
+  loginError: {
+    status: 401,
+    body: {
+      detail: 'Invalid credentials'
+    }
+  },
+  unauthorized: {
+    status: 401,
+    body: {
+      detail: 'Not authenticated'
+    }
+  }
+};