feat: add DP memory controls and physical batch sizing

[binaryaaron]

• feat: add DP memory training controls
• fix: estimate preflight VRAM from quantization state
• feat: add physical batch size constraints
• fix: cover DP batching and progress edge cases

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[codecov]

Codecov Report

❌ Patch coverage is 56.75676% with 160 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...fe_synthesizer/privacy/dp_transformers/dp_utils.py	12.82%	136 Missing ⚠️
tests/smoke/test_training_cpu.py	37.50%	20 Missing ⚠️
...o_safe_synthesizer/training/huggingface_backend.py	60.00%	2 Missing ⚠️
src/nemo_safe_synthesizer/config/training.py	95.65%	1 Missing ⚠️
...o_safe_synthesizer/preflight/checks/environment.py	83.33%	1 Missing ⚠️

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