docs: complete SQL reference, enrich Functions drafts, rename OSS to Embedded (#4732)

## Summary

- Complete the SQL reference: `ATTACH DATABASE`, the `CHANGES` clause,
and
`dedupe()`/`duplicate_pairs()` (verified against current sophon source;
these were recently renamed from
`vector_dedup`/`vector_duplicate_pairs`).
  Fix the blob-column default-projection claim and add the previously
  undocumented `blob_descriptor()`.
- Enrich the gated Functions draft (still `.mintignore`'d, pre-release):
  chained Functions over blob outputs, GPU-produced blobs, Secrets,
  multi-input/output binding, `code=[module]` packaging.
- Upgrade the materialized-view and computed-column auto-refresh drafts
with
  precise, verified catch-up semantics, and add the missing `ALTER
  MATERIALIZED VIEW` / `CREATE ... WITH(...)` sections (also gated — the
  automatic-refresh scheduler is still dev/staging-only).
- Thread one running example (video frames → GPU extract/caption → dedup
→
auto-refreshing materialized view) through Functions, materialized
views,
and the LeRobotDataset integration guide instead of a separate tutorial.
- Rename "LanceDB OSS"/"OSS" to "LanceDB Embedded"/"Embedded" throughout
  (52 files); activate the existing availability-comparison mechanism on
  `basics/offerings.mdx` for a full feature-by-feature comparison table.

docs/web/integrations/data/pandas_and_pyarrow.mdx

@@ -2,12 +2,8 @@
 title: "Pandas and PyArrow"
 sidebarTitle: "Pandas & PyArrow"
 availability:
-  oss: available
+  embedded: available
   enterprise: available
-  summary: >-
-    DataFrames go into `create_table` and come back from query results the same
-    way for local and deployment tables.
-
 ---
 
 import {

docs/web/integrations/data/polars_arrow.mdx

@@ -2,13 +2,8 @@
 title: "Polars"
 sidebarTitle: "Polars & Arrow"
 availability:
-  oss: available
+  embedded: available
   enterprise: available
-  summary: >-
-    Polars data goes into `create_table`, and query results come back as Polars
-    DataFrames, for local and deployment tables alike; a LazyFrame over a whole
-    table is local only.
-
 ---
 
 import {

docs/web/integrations/data/pydantic.mdx

@@ -2,13 +2,8 @@
 title: "Pydantic"
 sidebarTitle: "Pydantic"
 availability:
-  oss: available
+  embedded: available
   enterprise: available
-  summary: >-
-    The SDK converts `LanceModel` schemas to Arrow, and query rows back to
-    models, in your process, so they work the same with local and deployment
-    tables.
-
 ---
 
 import {