RSDK-14589 Seed $framesystem into module dependencies

[JohnN193]

Problem

A Python modular resource is constructed with (config, dependencies) and never sees the parent RobotClient. Module._get_dependencies only resolves the dependency strings viam-server sends, and viam-server deliberately strips framesystem and $framesystem from module Validate results (rdk module/modmanager/manager.go, RSDK-12124). So a Python module has no way to reach the frame system. Go seeds $framesystem into every resource's dependencies in module/resources.go getDependenciesForConstruction, on both construction and reconfigure.

Depends on #1271 (FrameSystem service and client).

Change

• Module._get_dependencies connects to the parent, then seeds the mapping with FrameSystem.get_resource_name("$framesystem") pointing at the parent's FrameSystemClient (via the get_service special case from RSDK-14588) before resolving the server sent dependencies. reconfigure_resource goes through add_resource, so one change covers both paths.
• The seed is skipped when there is no parent, which is the VIAM_NO_MODULE_PARENT case.
• FrameSystem.from_dependencies docstring now promises the seed.
• examples/complex_module/README.md gains a short section showing FrameSystem.from_dependencies(dependencies) in a constructor.

Behavior note: adding a resource with zero dependencies previously never touched the parent. It now does, matching Go, where m.parent is always set by the time a resource is constructed. The module test fixture mocks _connect_to_parent for that reason, and tests that need a parent set module.parent themselves as before.

Tests

tests/test_module.py:

• test_add_resource_seeds_frame_system: viam-server sends only rdk:component:arm/arm1, the constructor still receives $framesystem next to it, FrameSystem.from_dependencies returns a working FrameSystemClient, and a reconfigure_resource round trip keeps the same client.
• test_no_frame_system_without_parent: no parent, no seed.

The mock MyGizmo now records the dependencies it was constructed with so the tests can inspect them.

make lint, pyright and make test pass (909 passed, 5 skipped).

Jira: RSDK-14589

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