feat: add cache-rt command and SYNC_CACHED_RT env variable for resource types (#7666)

* feat: add cache-rt command and SYNC_CACHED_RT env variable for resource types

Add a new CLI command `cache-rt` that fetches resource types from the hub
and caches them locally. This command is run during Docker image build to
pre-populate the cache.

Add `SYNC_CACHED_RT` environment variable that, when set to true, syncs
cached resource types to the admins workspace's resource_type table on
server startup. The sync is incremental - it only updates resource types
that have changed.

Changes:
- Add HUB_RT_CACHE_DIR constant for resource type cache location
- Add cache-rt CLI command to fetch and cache resource types from hub
- Add sync_cached_resource_types() to sync cached types to database
- Update all Dockerfiles to run cache-rt during image build

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* fix: parse schema string from hub into proper JSONB

The hub API returns schema as a JSON string that needs to be parsed
into a proper JSON value before inserting into the database.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

Dockerfile

@@ -254,7 +254,7 @@ COPY ./frontend/src/lib/hubPaths.json ${APP}/hubPaths.json
 
 RUN windmill cache ${APP}/hubPaths.json && rm ${APP}/hubPaths.json
 
-
+RUN windmill cache-rt
 
 # Create a non-root user 'windmill' with UID and GID 1000
 RUN addgroup --gid 1000 windmill && \