feat: support TiCI vector query path

[kolafish]

Summary

• add TiCI vector query mode alongside the existing FTS TiCI path
• wire tipb.IndexScan.tici_vector_query_info through TiCIScan, StorageTantivy, TiCIReadTaskPool, and TantivyInputStream
• call tici-search-lib::search_vector(...) for vector scans and keep search(...) for expression/fulltext scans
• harden vector-only rollout with query payload validation and float/vector result decoding
• update contrib/tici and contrib/tipb to vector-capable upstream commits
• add short design notes under docs/

Scope

This PR intentionally targets the current vector-only rollout.
Pushed-down vector + filter remains part of the long-term payload shape, but producer-side population is still deferred.

Details

• accept either fts_query_info or tici_vector_query_info in TiFlash TiCI scan planning
• add a dedicated vector execution path in the TiCI read task pool and input stream
• validate top_k, column_id, dimension, metric, query_vector byte length, and finite float values before crossing the FFI boundary
• decode FLOAT/DOUBLE result fields and Array(Float32) vector payloads from TiCI rows
• fail fast when a vector query requests a vector column that TiCI does not materialize
• fix Apple shared-library linking for tici_search_lib

Upstream dependencies

• tipb: TiCIVectorQueryInfo merged upstream
• tici: vector query support merged upstream
• tidb planner/DDL side: PR #67102 and #67103

Validation

• built dbms/src/Server/tiflash successfully on macOS in cmake-build-codex-release

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