feat: Add Deepseek model keywords to package.json

- Add new keywords: deepseek, deepseek-r1, deepseek-v3 to package metadata
- Update package.json to include additional model identifiers
- Enhance searchability with new AI model references

Author: yangbobo2021

package.json

@@ -35,6 +35,9 @@
     "c++",
     "codex",
     "co-pilot",
+    "deepseek",
+    "deepseek-r1",
+    "deepseek-v3",
     "devchat",
     "documentation",
     "go",