feat: added-flagsmith-node-provider (#1276)

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## This PR
- Adds flagsmith nodeJS provider to the ecosystem list

### Related Issues

### Notes

### Follow-up Tasks

### How to test
<img width="1170" height="622" alt="image"
src="https://github.com/user-attachments/assets/a6dac9ce-8de2-4585-8ad4-fd6e784c8b7a"
/>

---------

Signed-off-by: wadii <[email protected]>

Author: Zaimwa9

src/datasets/providers/flagsmith.ts

@@ -23,6 +23,12 @@ export const Flagsmith: Provider = {
       href: 'https://github.com/open-feature/js-sdk-contrib/tree/main/libs/providers/flagsmith-client',
       category: ['Client'],
     },
+    {
+      technology: 'JavaScript',
+      vendorOfficial: true,
+      href: 'https://github.com/open-feature/js-sdk-contrib/tree/main/libs/providers/flagsmith',
+      category: ['Server'],
+    },
     {
       technology: '.NET',
       vendorOfficial: true,