feat: unify config across all tools, add JSON config and make setup wizard

[calmcacil]

Summary

Complete overhaul of CalmsToolkit configuration, performance, and code quality.

New Infrastructure

• Shared JSON config at ~/.config/calmstoolkit/config.json — all tools read from same file
• Interactive setup wizard (make setup) — step-by-step prompts to generate config
• Shared color.go — unified ANSI constants with proper ColorOrange fix, control sequences
• config.go — ToolkitConfig type, LoadToolkitConfig()/Save()/Validate()/DefaultToolkitConfig()
• config_test.go — 8 tests for config round-trip, validation, defaults

Bug Fixes

Before	After
config.Timeout was dead code, all fetches hardcoded 10s	config.Timeout wired into shared http.Client
ColorOrange == ColorYellow (identical)	ColorOrange = \033[38;5;208m (256-color orange)
Movie date parse errors silently dropped	Logged to stderr with debug info
Watch mode: for{...} — killed via SIGKILL	signal.NotifyContext — graceful SIGINT/SIGTERM
clearScreen() spawned exec.Command("clear")	ANSI \033[2J\033[H
truncateText panicked on maxLen <= 3	Handles all edge cases safely
formatMovie fixedChars calculation off by 2	Correct len(timeStr) + 8

Performance

• Concurrent fetching: All Sonarr/Radarr instances fetched in parallel via errgroup (was fully sequential)
• Shared HTTP client: Single http.Client{Timeout, Transport} with keep-alive (was new client per request)
• Queue optimization: ?pageSize=1 to minimize payload (was fetching all queue items)
• context.Context: Threaded through entire fetch chain enabling cancellation/timeout

Code Quality

Before	After
Date logic duplicated in 3 places	calculateDateRange() helper, single source
Config passed by value everywhere	*CalendarToolConfig pointer
Instance names hardcoded Sonarr-1	Configurable from ArrInstance.Name
buildDayContent mutated caller's slice	Defensive slices.Clone()
Manual contains/ at output end

• -filter flag: Comma-separated: missing,available,premieres,monitored
• -monitored-only flag
• -no-banner flag — suppress header
• -quiet flag — suppress queue warnings

File Changes

 16 files changed, 2373 insertions(+), 2088 deletions(-)
 create mode 100644 cmd/calmstoolkit-setup/main.go
 create mode 100644 color.go
 create mode 100644 config.go
 create mode 100644 config_test.go

Testing

All 131 tests pass across all 5 test suites (shared + 4 tool suites).