[COMPLETED] Task: Implement memory feature to remember selected environment

Issue Analysis

When using cce with multiple environments, newly added environments appear at the end, requiring manual navigation each time. Need to implement memory functionality to remember the last selected environment and make it the default for next launch.

Plan

[COMPLETED] Analyze current configuration structure and UI logic
[COMPLETED] Design memory storage mechanism (config file structure change)
[COMPLETED] Implement last selected environment tracking
[COMPLETED] Update UI logic to default to remembered environment
[COMPLETED] Add unit tests for memory functionality
[COMPLETED] Test the feature end-to-end

Implementation Summary

Changes Made:

Added LastSelected string field to Config struct (main.go:103)
Added updateLastSelected() and getLastSelectedIndex() functions (config.go:410-429)
Updated UI selection functions to start with remembered environment (ui.go:756, ui.go:801)
Modified main function to save selection after interactive mode (main.go:735-739)
Added environment removal cleanup to clear last_selected (config.go:402-405)
Created comprehensive unit tests in memory_test.go

Test Coverage:

TestUpdateLastSelected: Tests environment selection updates and validation
TestGetLastSelectedIndex: Tests index retrieval with various edge cases
TestRemoveEnvironmentFromConfigLastSelected: Tests cleanup on environment removal
TestConfigFileLastSelectedPersistence: Tests config persistence across save/load
TestConfigBackwardCompatibility: Tests compatibility with old config formats

Key Features:

Remembers last selected environment across sessions
Defaults to previously selected environment in UI
Gracefully handles missing/invalid last selected entries
Maintains backward compatibility with existing configs
Cleans up last_selected when environment is removed

Links

The feature is now complete and ready for review!

feat 记录选择的env下次默认选择 #11

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