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>

shared/auth/__init__.py

@@ -0,0 +1,23 @@
+"""
+ROA2WEB Shared Authentication Module
+
+This module provides JWT-based authentication functionality that can be shared
+across all ROA2WEB microservices.
+
+Components:
+- jwt_handler: JWT token creation, validation, and refresh
+- auth_service: Oracle database authentication integration
+- middleware: FastAPI middleware for token validation
+- dependencies: FastAPI dependencies for protected routes
+- models: Pydantic models for authentication data
+- routes: Template authentication routes for FastAPI apps
+"""
+
+from .jwt_handler import jwt_handler, JWTHandler, TokenData, TokenResponse
+
+__all__ = [
+    'jwt_handler',
+    'JWTHandler', 
+    'TokenData',
+    'TokenResponse'
+]