### Check for existing issues

- [x] I have searched the existing issues and checked that my issue is not a duplicate.

### What happened?

### Bug Description

When using the LiteLLM proxy router with multiple deployments of the same embedding `model_name` across different hosts, failover never occurs when a host is unreachable. The router attempts the selected deployment once, fails, and returns an error — no retries, no failover to other deployments in the model group.

### Root Cause

In `litellm/router.py`, the `aembedding()` method does not set `num_retries` in kwargs before calling `async_function_with_fallbacks()`. Compare `aembedding` to every other router method (`acompletion`, `acreate_file`, `atext_completion`, etc.) which all include this line:

```python kwargs["num_retries"] = kwargs.get("num_retries", self.num_retries) ```

**`aembedding` (missing the line — bug):** ```python async def aembedding(self, model, input, is_async=True, **kwargs): try: kwargs["model"] = model kwargs["input"] = input kwargs["original_function"] = self._aembedding # ✓ # kwargs["num_retries"] = ... # ✗ MISSING sel…