Add Paperless Finance Report Tool - Complete implementation

A Python CLI tool for generating financial reports from Paperless-ngx:

- Phase 1 (MVP): Config handling, Paperless API client with auth and
  pagination, custom fields extraction, tag-based summation, CLI output
- Phase 2 (Grouping): Multiple grouping criteria (tag, correspondent,
  category, payment type, month, quarter, year), percentage distribution
- Phase 3 (Reports): HTML reports with Chart.js diagrams (doughnut, bar,
  line charts), PDF export via WeasyPrint, JSON and CSV export
- Phase 4 (Comfort): Automatic tag ID resolution, disk caching with
  diskcache, colorized logging, comprehensive error handling

Features:
- Flexible date filtering (year, month, date range)
- Period comparison with change analysis
- Swiss franc formatting (CHF with apostrophe separators)
- Interactive HTML reports with sortable tables and document links
- Multiple output formats (CLI, HTML, PDF, JSON, CSV)

paperless-report/__init__.py

@@ -0,0 +1,24 @@
+"""
+Paperless Finance Report Tool
+
+Generiert Finanzberichte aus Paperless-ngx Dokumenten.
+"""
+
+__version__ = '1.0.0'
+__author__ = 'Your Name'
+
+from config import Config, get_config
+from paperless_client import PaperlessClient, PaperlessAPIError
+from extractor import DocumentExtractor, DataAggregator, FinanceDocument
+from report_generator import ReportGenerator
+
+__all__ = [
+    'Config',
+    'get_config',
+    'PaperlessClient',
+    'PaperlessAPIError',
+    'DocumentExtractor',
+    'DataAggregator',
+    'FinanceDocument',
+    'ReportGenerator',
+]