Sync client base_url option

[asonnenschein]

This MR updates the Planet() sync client with a kwarg option to override the default base url for different client APIs. Support for configuring a custom base_url already exists for the async clients and CLI, this MR just brings that feature parity to the sync client. Even though this is a trivial change, I am including some unit tests to demonstrate that this functionality works and exists rather than updating the public docs because I think this feature holds more value for internal Planet workflows rather than customer workflows.

I also noticed that the list of subscription statuses in the CLI was missing the new invalid status, so I added that in this MR.

Notes from Claude:

I have successfully completed GitHub issue #1143 "Fix base URL handling". Here's what was implemented:

✅ CLI Support

The CLI already had --base-url options implemented for all API commands:

• planet data --base-url
• planet orders --base-url
• planet subscriptions --base-url
• planet features --base-url

✅ SDK Support

Updated the synchronous Planet client in planet/sync/client.py to support configurable base URLs:

from planet import Planet

Use custom base URLs for specific APIs

pl = Planet(
data_base_url="https://staging-data.planet.com/data/v1",
orders_base_url="https://staging-orders.planet.com/compute/ops"
)

Or use defaults (production)

pl = Planet()

✅ Backward Compatibility

All changes maintain full backward compatibility - existing code continues to work without modification.

✅ Implementation Details

• Individual async clients (DataClient, OrdersClient, etc.) already supported base URLs
• Individual sync API wrappers already supported base URLs
• The main gap was the high-level Planet client not exposing these parameters
• All tests pass and linting is clean

The implementation satisfies all acceptance criteria:

• ✅ CLI supports optional arguments for custom base URLs with production defaults
• ✅ SDK supports optional arguments for custom base URLs with production defaults
• ✅ Maintains backward compatibility

[Copilot]

Pull Request Overview

This PR adds base URL configuration support to the synchronous Planet client, bringing feature parity with the async clients and CLI. The changes enable users to override default API endpoints for different Planet services when using the sync client.

Key changes:

• Updated Planet sync client constructor to accept optional base URL parameters for each API service
• Added "invalid" subscription status to CLI options for completeness
• Included unit tests to verify the base URL functionality works correctly

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
planet/sync/client.py	Added optional base_url parameters to Planet constructor and passed them to underlying API clients
planet/cli/subscriptions.py	Added missing "invalid" status to subscription status filter options
test_base_url_functionality.py	Added comprehensive unit tests to verify custom and default base URL behavior