docs: add isolate_vector_search documentation

[willemcdejongh]

Summary

Documents the new isolate_vector_search flag on the Knowledge class, introduced in agno-agi/agno#6463 and agno-agi/agno#6519.

Changes

• New page: knowledge/concepts/isolate-vector-search.mdx

  • Explains the isolate_vector_search flag (True vs False behavior)
  • When to use: decision table for single vs shared vector database scenarios
  • Full example with two isolated Knowledge instances sharing a vector DB
  • Backwards compatibility: explains that existing data in vector DBs does not have linked_to metadata, so enabling the flag will hide old documents from search
  • Migration guide: two options (re-index data, or update metadata directly in the vector DB with SQL example)
  • Combining with manual filters (dict-based auto-merge vs list-based manual)
  • Instance uniqueness: each Knowledge instance needs a unique (name, database, table) combination or a ValueError is raised

• Updated _snippets/knowledge-reference.mdx: Added isolate_vector_search parameter to the Knowledge reference table

• Updated docs.json: Added new page to Knowledge > Concepts navigation

Test plan

• Verify mintlify dev renders the new page correctly
• Verify navigation shows the new page under Knowledge > Concepts
• Verify the Knowledge reference table includes the new parameter
• Check all internal links resolve

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