feat(mcp): add RedisJSON and RediSearch module tools

[joshrotenberg]

Summary

Add 34 new MCP tools for RedisJSON and RediSearch modules, expanding the database toolset from 90 to 124 tools.

Part of the "redisctl-mcp as Redis Database Powertool" epic (#833).

RedisJSON (16 tools) - #835

Safety	Tools
Read-only	json_get, json_mget, json_type, json_arrlen, json_objkeys, json_objlen, json_strlen
Write	json_set (NX/XX), json_numincrby, json_arrappend, json_arrinsert, json_toggle
Destructive	json_del, json_clear, json_arrpop, json_arrtrim

RediSearch (18 tools) - #837

Safety	Tools
Read-only	ft_list, ft_info, ft_search, ft_aggregate, ft_explain, ft_profile, ft_tagvals, ft_syndump, ft_dictdump
Write	ft_create, ft_alter, ft_synupdate, ft_dictadd, ft_aliasadd, ft_aliasupdate
Destructive	ft_dropindex, ft_aliasdel, ft_dictdel

Notable features:

• ft_create supports full schema definition with field types (TEXT, NUMERIC, TAG, GEO, VECTOR), SORTABLE, WEIGHT, SEPARATOR, AS alias
• ft_search supports LIMIT, SORTBY, RETURN, NOCONTENT, VERBATIM, WITHSCORES
• ft_aggregate supports LOAD and raw pipeline args for GROUPBY/REDUCE/SORTBY
• ft_profile profiles both SEARCH and AGGREGATE queries
• ft_aliasupdate enables zero-downtime index migrations
• All JSON tools support JSONPath expressions with $ root default

Registered as database:json and database:search sub-modules, selectable via --tools database:json,database:search.

Test plan

• cargo clippy -p redisctl-mcp --all-features -- -D warnings passes
• cargo fmt --all -- --check passes
• CI passes
• Manual testing against Redis with JSON/Search modules loaded

Closes #835, closes #837