refactor: Major reorganization of optimization_engine module structure

BREAKING CHANGE: Module paths have been reorganized for better maintainability.
Backwards compatibility aliases with deprecation warnings are provided.

New Structure:
- core/           - Optimization runners (runner, intelligent_optimizer, etc.)
- processors/     - Data processing
  - surrogates/   - Neural network surrogates
- nx/             - NX/Nastran integration (solver, updater, session_manager)
- study/          - Study management (creator, wizard, state, reset)
- reporting/      - Reports and analysis (visualizer, report_generator)
- config/         - Configuration management (manager, builder)
- utils/          - Utilities (logger, auto_doc, etc.)
- future/         - Research/experimental code

Migration:
- ~200 import changes across 125 files
- All __init__.py files use lazy loading to avoid circular imports
- Backwards compatibility layer supports old import paths with warnings
- All existing functionality preserved

To migrate existing code:
  OLD: from optimization_engine.nx_solver import NXSolver
  NEW: from optimization_engine.nx.solver import NXSolver

  OLD: from optimization_engine.runner import OptimizationRunner
  NEW: from optimization_engine.core.runner import OptimizationRunner

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

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

optimization_engine/reporting/__init__.py

@@ -0,0 +1,44 @@
+"""
+Reporting & Analysis
+====================
+
+Report generation and results analysis.
+
+Modules:
+- report_generator: HTML/PDF report generation
+- markdown_report: Markdown report format
+- results_analyzer: Comprehensive results analysis
+- visualizer: Plotting and visualization
+- landscape_analyzer: Design space analysis
+"""
+
+# Lazy imports to avoid import errors
+def __getattr__(name):
+    if name == 'generate_optimization_report':
+        from .report_generator import generate_optimization_report
+        return generate_optimization_report
+    elif name == 'generate_markdown_report':
+        from .markdown_report import generate_markdown_report
+        return generate_markdown_report
+    elif name == 'MarkdownReportGenerator':
+        from .markdown_report import MarkdownReportGenerator
+        return MarkdownReportGenerator
+    elif name == 'ResultsAnalyzer':
+        from .results_analyzer import ResultsAnalyzer
+        return ResultsAnalyzer
+    elif name == 'Visualizer':
+        from .visualizer import Visualizer
+        return Visualizer
+    elif name == 'LandscapeAnalyzer':
+        from .landscape_analyzer import LandscapeAnalyzer
+        return LandscapeAnalyzer
+    raise AttributeError(f"module 'optimization_engine.reporting' has no attribute '{name}'")
+
+__all__ = [
+    'generate_optimization_report',
+    'generate_markdown_report',
+    'MarkdownReportGenerator',
+    'ResultsAnalyzer',
+    'Visualizer',
+    'LandscapeAnalyzer',
+]