Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@plane/api/collections/base.py`:
- Around line 29-84: Append a trailing slash to every collection endpoint URL
used by the collection API methods in plane/api/collections/base.py lines 29-84,
every member endpoint in plane/api/collections/members.py lines 24-72, and every
page endpoint in plane/api/collections/pages.py lines 33-104. Update the URL
construction in the relevant list, create, retrieve, update, delete, and related
methods while preserving their existing parameters and behavior.

In `@plane/api/collections/members.py`:
- Around line 27-72: Rename the public CRUD methods consistently: in
plane/api/collections/members.py lines 27-41, rename add to create, and lines
64-72, rename remove to delete; in plane/api/collections/pages.py lines 39-53,
rename add to create, and lines 94-104, rename remove to delete. Preserve each
method’s existing behavior and signatures while applying the required CRUD
naming convention.

In `@plane/api/collections/pages.py`:
- Around line 55-70: The search method currently accepts a raw string and
manually builds query parameters. Add a dedicated Pydantic search-query DTO,
update search to accept that DTO, serialize it using
model_dump(exclude_none=True), and retain
CollectionPageSearchResult.model_validate() for response validation.

In `@tests/unit/test_collections.py`:
- Around line 111-119: In tests/unit/test_collections.py at lines 111-119,
165-175, and 206-210, narrow the exception handling around page and collection
deletion so unexpected remote cleanup failures propagate; suppress only the
documented idempotent “not found” response, and remove blanket Exception/pass
handling at each affected cleanup site.
- Around line 65-77: Move the cleanup guard in this test to begin immediately
after creating the source resource. Initialize target and page variables to
None, wrap their creation in try, and update the cleanup logic to conditionally
delete each resource that was successfully created, including source.