feat: add UTM-tagged docs links to SDK warnings and enterprise-only errors (#4797)

Add a central documentation link registry (`lancedb::docs::DocLink`) in
the Rust core that builds `docs.lancedb.com` URLs with UTM parameters
(`utm_source=lancedb_sdk`, `utm_medium=warning|error`,
`utm_campaign=<id>`, `utm_content=<sdk>-<version>`) placed before any
`#anchor` fragment and without user-identifying data.

- Initialize `utm_content` per language binding (`python`, `nodejs`,
`cli`, defaulting to `rust`) and expose the link builder to Python so
`DBConnection` and `Job` stubs reuse the core definitions.
- Append published documentation links to Enterprise-only `NotSupported`
/ `NotImplementedError` errors across database, job, catalog, and table
operations.
- Emit rate-limited maintenance warnings (once per table per process
when `warn` logging is enabled) when opening a native table with at
least 100 small fragments (`< 100k` physical rows each) or at least
1,000,000 unindexed rows on an optimizable user index, reading only
manifest metadata without opening data or `_indices/` files, and
document the thresholds in the compaction and reindexing guides.
- Verify published/in-repo `docs/web/` targets and `#anchor` fragments
in unit tests and include extracted SDK links in the scheduled
`docs-link-check` workflow.

Linear: OSS-2772

nodejs/src/lib.rs

@@ -115,6 +115,7 @@ pub struct ConnectNamespaceOptions {
 
 #[napi_derive::module_init]
 fn init() {
+    lancedb::docs::set_sdk_ident("nodejs", env!("CARGO_PKG_VERSION"));
     let env = Env::new()
         .filter_or("LANCEDB_LOG", "warn")
         .write_style("LANCEDB_LOG_STYLE");