Joseff f4f8bed9f7 Go: implement Encode (embeddings) in Google Gemini driver (#14682) ...

### What problem does this PR solve?

- Implements the `Encode` method in the Google Gemini driver, which was
previously a stub returning `not implemented`
- Uses the `google.golang.org/genai` SDK's `EmbedContent` API, which
routes to the `batchEmbedContents` endpoint internally — all texts are
sent in a single request
- Adds `text-embedding-004` (max 2048 tokens) to
`conf/models/google.json`
- Response values are `[]float32` from the SDK and are cast to
`[]float64` to satisfy the `ModelDriver` interface

## Files changed

- `internal/entity/models/google.go` — full `Encode` implementation
- `conf/models/google.json` — adds `text-embedding-004` embedding model

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

2026-05-11 11:24:21 +08:00

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