Add Superlinked embedding integration page (#211)

* Add Superlinked embedding integration page

Adds a docs page for Superlinked (SIE), a self-hosted inference engine
for embedding, reranking, and extraction. The sie-lancedb package
registers SIE as a first-class embedding function in LanceDB's registry
("sie" and "sie-multivector"), supports 85+ models, provides a
SIEReranker for hybrid search, and an SIEExtractor for entity extraction
via enrich_table() with native MultiVector/ColBERT support.

* Apply suggestions from code review

Co-authored-by: Prashanth Rao <35005448+prrao87@users.noreply.github.com>

---------

Co-authored-by: Prashanth Rao <35005448+prrao87@users.noreply.github.com>

Author: fm1320

docs/docs.json

@@ -239,7 +239,8 @@
                   "integrations/embedding/openai",
                   "integrations/embedding/openclip",
                   "integrations/embedding/sentence-transformers",
-                  "integrations/embedding/voyageai"
+                  "integrations/embedding/voyageai",
+                  "integrations/embedding/superlinked"
                 ]
               },
               {

docs/integrations/embedding/superlinked.mdx

@@ -0,0 +1,136 @@
+---
+title: Superlinked
+sidebarTitle: Superlinked
+---
+
+[Superlinked](https://superlinked.com) is a self-hosted inference engine (SIE) for embedding, reranking, and extraction. The `sie-lancedb` package registers SIE as a first-class embedding function in LanceDB's embeddings registry, so embeddings are computed automatically on insert and search. You need a running SIE instance - see the [Superlinked quickstart](https://superlinked.com/docs) for deployment options.
+
+## Installation
+
+<CodeGroup>
+pip install sie-lancedb
+```
+
+npm install @superlinked/sie-lancedb @lancedb/lancedb
+```
+</CodeGroup>
+
+## Registered functions
+
+Importing `sie_lancedb` registers two embedding functions in LanceDB's registry:
+
+| Name | Purpose |
+|---|---|
+| `"sie"` | Dense text embeddings |
+| `"sie-multivector"` | ColBERT-style late interaction with MaxSim scoring |
+
+Supported parameters on `.create()`:
+
+| Parameter | Type | Description |
+|---|---|---|
+| `model` | `str` | Any of 85+ SIE-supported models (e.g. `BAAI/bge-m3`, `NovaSearch/stella_en_400M_v5`, `jinaai/jina-colbert-v2`) |
+| `base_url` | `str` | URL of the SIE endpoint (e.g. `http://localhost:8080`) |
+
+## Usage
+
+import lancedb
+from lancedb.embeddings import get_registry
+from lancedb.pydantic import LanceModel, Vector
+import sie_lancedb  # registers "sie" and "sie-multivector"
+
+sie = get_registry().get("sie").create(
+    model="BAAI/bge-m3",
+    base_url="http://localhost:8080",
+)
+
+class Documents(LanceModel):
+    text: str = sie.SourceField()
+    vector: Vector(sie.ndims()) = sie.VectorField()
+
+db = lancedb.connect("~/.lancedb")
+table = db.create_table("docs", schema=Documents, mode="overwrite")
+
+table.add([
+    {"text": "Machine learning is a subset of AI."},
+    {"text": "Neural networks use multiple layers."},
+    {"text": "Python is popular for ML development."},
+])
+
+results = table.search("What is deep learning?").limit(3).to_list()
+```
+
+LanceDB handles embedding generation for both inserts and queries automatically, based on the `SourceField` / `VectorField` declarations on the schema.
+
+## Hybrid search with reranker
+
+`SIEReranker` plugs into LanceDB's hybrid search pipeline. It uses SIE's cross-encoder `score()` to rerank combined vector + full-text search results. You need a full-text search index on the column first:
+
+from sie_lancedb import SIEReranker
+
+# Create FTS index for hybrid search
+table.create_fts_index("text", replace=True)
+
+results = (
+    table.search("What is deep learning?", query_type="hybrid")
+    .rerank(SIEReranker(model="jinaai/jina-reranker-v2-base-multilingual"))
+    .limit(5)
+    .to_list()
+)
+
+for r in results:
+    print(f"{r['_relevance_score']:.3f}  {r['text']}")
+```
+
+The reranker also works with pure vector or pure FTS search via `.rerank()`.
+
+## ColBERT / multivector
+
+`SIEMultiVectorEmbeddingFunction` (registered as `"sie-multivector"`) works with LanceDB's native `MultiVector` type and MaxSim scoring for ColBERT and ColPali models:
+
+from lancedb.pydantic import MultiVector
+
+sie_colbert = get_registry().get("sie-multivector").create(
+    model="jinaai/jina-colbert-v2",
+    base_url="http://localhost:8080",
+)
+
+class ColBERTDocs(LanceModel):
+    text: str = sie_colbert.SourceField()
+    vector: MultiVector(sie_colbert.ndims()) = sie_colbert.VectorField()
+
+table = db.create_table("colbert_docs", schema=ColBERTDocs, mode="overwrite")
+table.add([{"text": "Machine learning is a subset of AI."}])
+
+# MaxSim search - query and document multivectors compared token-by-token
+results = table.search("What is ML?").limit(5).to_list()
+```
+
+## Entity extraction
+
+`SIEExtractor` adds entity extraction to LanceDB's data-enrichment workflows. Extract entities from a text column and merge the results back as a structured Arrow column - enabling filtered search on extracted entities:
+
+```python
+from sie_lancedb import SIEExtractor
+
+extractor = SIEExtractor(
+    base_url="http://localhost:8080",
+    model="urchade/gliner_multi-v2.1",
+)
+
+extractor.enrich_table(
+    table,
+    source_column="text",
+    target_column="entities",
+    labels=["person", "technology", "organization"],
+    id_column="id",
+)
+```
+
+The `entities` column stores structured Arrow data (`list<struct<text, label, score, start, end, bbox>>`), so you can filter on extracted entities in queries.
+
+## Links
+
+- [`sie-lancedb` on PyPI](https://pypi.org/project/sie-lancedb/)
+- [`@superlinked/sie-lancedb` on npm](https://www.npmjs.com/package/@superlinked/sie-lancedb)
+- [Superlinked on GitHub](https://github.com/superlinked/sie)
+- [Superlinked docs](https://superlinked.com/docs)