docs: 50x creative improvement - professional SVG assets

New professional SVGs:
- hero-banner.svg (53KB) - GitHub banner
- routing-flow-pro.svg (62KB) - Complete pipeline diagram
- cost-comparison-pro.svg (69KB) - Cost savings chart
- feature-matrix-pro.svg (84KB) - Competitor comparison
- provider-health-pro.svg (69KB) - Health monitoring
- benchmark-results-pro.svg (51KB) - Benchmark bars
- tier-distribution-pro.svg (54KB) - Pie chart
- growth-chart-pro.svg (25KB) - Growth trajectory
- social-preview-pro.svg (57KB) - OG image
- logo-icon.svg (4KB) - Geometric icon

All using clean professional design with consistent color scheme.
Updated README to use new pro versions.

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Author: Subhajit das