docs(readme): expand the v3.8.51 teaser into an in-flight feature grid with provider numbers

Co-authored-by: backryun <bakryun0718@proton.me>

README.md

@@ -56,6 +56,26 @@
 
 <br/>
 
+## 📈 The Gateway Keeps Growing
+
+<div align="center">
+
+|                      | v3.8.49 | **v3.8.50** |                           |
+| -------------------- | :-----: | :---------: | ------------------------- |
+| 🌐 Providers         |   291   |   **338**   | **+47 in a single cycle** |
+| 🧠 Documented models |  500+   |  **1200+**  | catalog more than doubled |
+
+**🔭 Next stop `v3.8.51+` — already in flight:**
+
+| 🖼️ **Modality Bridge** — vision landed in v3.8.50; video next                                    | 📡 **Radar** — live free-model catalog overlay               |
+| ------------------------------------------------------------------------------------------------ | ------------------------------------------------------------ |
+| ⚖️ **Quota-aware scheduling** — route by remaining quota                                         | 📊 **Quota telemetry** — adaptive routing + status inventory |
+| 🤝 **338 providers → more queued** — 3 PRs open: Tencent AI Studio, ZCode & a free-gateway batch | 🗺️ [Roadmap](ROADMAP.md) → riding the rail to **v3.9.0 LTS** |
+
+</div>
+
+<br/>
+
 ## 🧩 Available
 
 [![npm version](https://img.shields.io/npm/v/omniroute?color=cb3837&logo=npm)](https://www.npmjs.com/package/omniroute)