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13e6554901
### What problem does this PR solve?
The OpenRouter `Encode` method silently swallowed malformed responses.
If a `data[]` item from the API was missing a field (`index`,
`embedding`, or unexpected shape), the loop did `continue` instead of
returning an error — leaving `nil` entries in the result slice. Callers
got back partial results with no indication anything went wrong, which
then crashes downstream consumers when they try to use a `nil` vector.
There were three concrete gaps:
- No count-mismatch check between `data` length and input texts (only
checked for empty)
- No duplicate-index detection (a duplicate would silently overwrite)
- Parse failures on individual items returned partial slices instead of
erroring
This PR replaces `map[string]interface{}` parsing with a typed
`openrouterEmbeddingResponse` struct and applies the same 3-layer
validation used in the other drivers (count mismatch → out-of-range
index → duplicate index), so any malformed response produces a clear
error instead of corrupted data.
### Type of change
- [x] Bug Fix (non-breaking change which fixes an issue)