Add Redis integration entry (#1777)

* Add Redis integration entry

Adds an integration catalog entry for `adk-redis`
(https://github.com/redis-developer/adk-redis), the Python package
that provides Redis-backed ADK integrations:

- RedisVL-backed search tools (vector, hybrid, range, text, SQL),
  including native FT.HYBRID on Redis 8.4+
- Session and long-term memory services that implement
  BaseSessionService and BaseMemoryService against
  Redis Agent Memory Server
- An McpToolset helper for RedisVL's own MCP server (`rvl mcp`),
  alongside the existing Agent Memory Server MCP helper
- Self-hosted and managed (Redis LangCache) semantic cache providers

Built and previewed with `mkdocs build --strict`; the page renders at
/integrations/redis/ and appears on the catalog grid.

* Minor fixes to Redis integration page

* Use ADK's native McpToolset for the RedisVL MCP integration

Per maintainer guidance on the PR review thread:

- Replace `create_redisvl_mcp_toolset(...)` (a third-party Python
  wrapper that adk-redis shipped briefly but does not ship in the
  released 0.0.5) with ADK's native `McpToolset` plus
  `StdioConnectionParams` + `StdioServerParameters(command="rvl", ...)`.
  Matches the pattern used by every other MCP catalog page
  (cartesia, chroma, mongodb, pinecone, qdrant).
- Add a `!!! note` admonition pointing readers to
  `/tools-custom/mcp-tools/` if they want to connect to the `rvl mcp`
  server from other ADK language SDKs.
- Rename the tab from "MCP toolset" to "RedisVL MCP server" and
  prepend a one-paragraph explanation.
- Update the surface table at the top: split the single "MCP toolsets"
  row into "RedisVL MCP" (native McpToolset against `rvl mcp`) and
  "AMS MCP toolset" (`create_memory_mcp_toolset`).
- Update the "Available tools" table: replace the
  `create_redisvl_mcp_toolset(...)` helper row with a description of
  the `rvl mcp` server's exposed tools and how to wire `McpToolset`
  to them.

Other clean-ups:
  - Drop the `pip install 'adk-redis[mcp-search]'` line; the extra was
    retired from adk-redis 0.0.5 along with the wrapper. Add a
    `pip install 'redisvl[mcp]>=0.18.2'` line for the MCP CLI.
  - Switch sample vectorizer to `redis/langcache-embed-v2`, matching
    the repo's runnable examples and the rest of the adk-redis docs.

Verified with `mkdocs build --strict` locally. The admonition renders;
the link to `/tools-custom/mcp-tools/` resolves.

* Switch Redis catalog icon to the official Red wordmark SVG

The page previously used the Redis org GitHub avatar PNG (460x460,
cube mark). Swap to `Redis_Logo_Red_RGB.svg` from the official Redis
brand kit (sourced via redis/redis-vl-python), matching the logo used
in the adk-redis README hero. SVG is acceptable for catalog assets
(see goodmem.svg precedent).

Note: this asset is a wordmark (viewBox ~500x156), wider than peer
catalog cards which are mostly square. If it renders awkwardly on the
catalog grid, swap back to a square cube-mark variant.

- Add `docs/integrations/assets/redis.svg`.
- Update `catalog_icon` in `redis.md` frontmatter.
- Drop `docs/integrations/assets/redis.png`.

Verified with `mkdocs build --strict`.

* Formatting and minor edits

* fix: remove AMS MCP toolset mentions per reviewer feedback

Remove create_memory_mcp_toolset() references from the overview table
and MCP tools table. This wrapper was removed from adk-redis in v0.0.6
(redis-developer/adk-redis#13). Users should use ADK's native McpToolset
with SseConnectionParams for Agent Memory Server MCP access.

Resolves comments from @koverholt on lines 29 and 239.

* fix: reorder tabs and table to lead with MCP, fix count to four ways

* feat: add AMS MCP server tab and MCP table entry

Add a separate code tab showing how to connect ADK's native McpToolset
to Agent Memory Server's MCP endpoint over SSE, based on the
fitness_coach_mcp example. Also add a corresponding row to the MCP
reference table. Update overview count to five ways.

* fix: rename AMS MCP to Sessions + Memory MCP server

* feat: split Semantic cache tab into self-hosted and LangCache

Add a separate LangCache tab with accurate code snippet using
LangCacheProvider and LangCacheProviderConfig (cache_id, api_key,
server_url). No local vectorizer needed for the managed service.

* refactor: move semantic caching into its own section

Semantic caching is a cross-cutting optimization rather than a core
integration approach. Move the self-hosted (RedisVL) and managed
(LangCache) cache tabs out of 'Use with agent' into a dedicated
'## Semantic caching' section. Drop the cache row from the overview
table, leaving four core approaches.

* fix: add descriptions to Sessions + Memory and Search tools tabs

* fix: semantic search -> hybrid search in Sessions + Memory description

* docs: link to adk-redis mkdocs site in additional resources

Primary docs link now points to redis-developer.github.io/adk-redis/.
The redis.io integration page is kept as a secondary reference.

* Remove redundant MCP table - does not show tools; make approaches wording future proof

* Readd MCP table with tools and options as before

---------

Co-authored-by: Kristopher Overholt <koverholt@google.com>

Author: nkanu17