ragflow

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Haruko386 45ee5ca9cd Go: implement provider: Jina (#14838 )

### What problem does this PR solve?

This PR completes the Jina provider

**The following functionalities are now supported:**

**Jina:**
- [ ] Chat / Stream Chat (Not available for now: [(Jina chat API
docs)](https://api.jina.ai/docs#/Search%20Foundation%20Models/chat_completions_v1_chat_completions_post))
- [x] Embedding
- [x] Rerank
- [x] Model listing
- [x] Provider connection checking
- [ ] ~~Balance~~

**Verified examples from the CLI:**

```plaintext
RAGFlow(user)> embed text 'walkerwhat' 'jumperwho' with 'jina-embeddings-v2-base-en@test@jina' dimension 16
+-----------+-------+
| dimension | index |
+-----------+-------+
| 768       | 0     |
| 768       | 1     |
+-----------+-------+

RAGFlow(user)> rerank query 'what is rag' document 'rag is retrieval augment generation' 'rag need llm' 'famous rag project includes ragflow' with 'jina-reranker-v2-base-multilingual@test@jina' top 3;
+-------+-----------------+
| index | relevance_score |
+-------+-----------------+
| 0     | 0.74316794      |
| 2     | 0.18713269      |
| 1     | 0.15817434      |
+-------+-----------------+

RAGFlow(user)> list supported models from 'jina' 'test'
+---------------------------------------------+
| model_name                                  |
+---------------------------------------------+
| Jina AI: Jina VLM                           |
| Jina AI: Jina Reranker v3                   |
| Jina AI: Jina Code Embeddings 0.5b          |
| Jina AI: Jina Code Embeddings 1.5b          |
| Jina AI: Jina Embeddings v4                 |
| Jina AI: Jina Reranker M0                   |
| Jina AI: ReaderLM v2                        |
| Jina AI: Jina Clip v2                       |
| Jina AI: Jina Embeddings v3                 |
| Jina AI: Jina Colbert v2                    |
| Jina AI: Reader LM 0.5b                     |
| Jina AI: Reader LM 1.5b                     |
| Jina AI: Jina Reranker v2 Base Multilingual |
| Jina AI: Jina Clip v1                       |
| Jina AI: Jina Reranker v1 Tiny EN           |
| Jina AI: Jina Reranker v1 Turbo EN          |
| Jina AI: Jina Reranker v1 Base EN           |
| Jina AI: Jina Colbert v1 EN                 |
| Jina AI: Jina Embeddings v2 Base ES         |
| Jina AI: Jina Embeddings v2 Base Code       |
| Jina AI: Jina Embeddings v2 Base DE         |
| Jina AI: Jina Embeddings v2 Base ZH         |
| Jina AI: Jina Embeddings v2 Base EN         |
| Jina AI: Jina Embedding B EN v1             |
| Jina AI: Jina Embeddings v5 Text Small      |
| Jina AI: Jina Embeddings v5 Omni Small      |
| Jina AI: Jina Embeddings v5 Omni Nano       |
| Jina AI: Jina Embeddings v5 Text Nano       |
+---------------------------------------------+

RAGFlow(user)> check instance 'test' from 'jina'
SUCCESS
```

### Type of change

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

2026-05-12 18:03:05 +08:00