Expose runtime exports to type checkers

[ethayu]

Summary

• Add TYPE_CHECKING imports for lazy uav.runtime exports.
• Preserve runtime lazy loading through __getattr__.
• Clear Pyright/Pylance reportUnsupportedDunderAll warnings for the runtime package initializer.

Verification

• source /opt/ros/humble/setup.bash && export PYTHONPATH=$PWD/controls/sae_2025_ws/src/uav:$PYTHONPATH && npx --yes pyright controls/sae_2025_ws/src/uav/uav/runtime/__init__.py --outputjson
• python3 -m compileall controls/sae_2025_ws/src/uav/uav/runtime/__init__.py
• ruff check controls/sae_2025_ws/src/uav/uav/runtime/__init__.py
• ruff format --check controls/sae_2025_ws/src/uav/uav/runtime/__init__.py

Refs #206
Part of #201

[ethayu]

Condensed into #205 so the UAV and runtime export-surface typing changes review together. #205 now fixes #204 and #206.