fix: add missing finish reasons

[Lash-L]

fixes #523

• Changes finish reason to a modeEnum to better handle duplicates.
• adds finish reason for 78 and 79
• This is not use don the HA side but I have been meaning to add a entity for it.

[Copilot]

Pull request overview

This PR migrates the RoborockFinishReason enum from RoborockEnum to RoborockModeEnum to better handle duplicate finish reason codes, and adds two new finish reason codes (78 and 79) for pet furniture detection features.

Changes:

• Converted RoborockFinishReason to use RoborockModeEnum with tuple-based values (name, code)
• Added CHECK_SAVED_PET_FURNITURES (code 78) and GET_SAVED_PET_FURNITURES (code 79) finish reasons
• Updated tests to access the finish reason code via the .code attribute

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
roborock/data/v1/v1_code_mappings.py	Migrated RoborockFinishReason from RoborockEnum to RoborockModeEnum, added two new finish reason codes (78, 79), and fixed a typo in FINISHED_CLEANING_5
tests/devices/traits/v1/test_clean_summary.py	Updated test assertions to check finish_reason.code instead of direct value comparison
tests/data/v1/test_v1_containers.py	Updated test assertions to check finish_reason.code instead of direct value comparison

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