Update README with vortexa core API and Indian examples for mini tier

Restore professional model card format matching commit f924ac24

Detailed comprehensive README for vtx-embed-7M

Update README for vtx-embed-7M

Add official MTEB 2.18.7 benchmark results (STS, Classification, Clustering) + professional model card

Update model card with complete multi-tier benchmark suite (MTEB, BEIR, CodeSearchNet, RepoBench, SWE-bench, Latency, Index Speed)

Update model card with LiquidAI LFM2.5 benchmark comparison & latencies

Upload Vortex-Embed-v4.5-sentence model and standalone engine