fix: resolve missing ~/.ccs/.claude/ directory during npm install (v4.3.7) (#16)

* fix(postinstall): make ora dependency optional to fix missing ~/.ccs/.claude/ directory

The root cause was that `ora` module was not available during `npm install`
when the postinstall script runs, causing both:
- .claude/ directory copy to fail (ClaudeDirInstaller)
- Symlink creation to fail (ClaudeSymlinkManager)

This resulted in the ~/.ccs/.claude/ directory not being created.

Changes:
- Made ora import optional in ClaudeDirInstaller
- Made ora import optional in ClaudeSymlinkManager
- Both classes now gracefully fallback to console.log when ora is unavailable
- Postinstall now successfully creates ~/.ccs/.claude/ and symlinks

Tested: Clean install now properly creates all directories and symlinks

* chore: bump version to 4.3.7

Version 4.3.7 - Postinstall Fix Release

Changes:
- Fixed missing ~/.ccs/.claude/ directory during npm install
- Made ora dependency optional in installer utilities
- Added CHANGELOG entry documenting the fix

Files updated:
- VERSION: 4.3.6 -> 4.3.7
- package.json: version updated
- lib/ccs: version string updated
- lib/ccs.ps1: version string updated
- installers/install.sh: version string updated
- installers/install.ps1: version string updated
- CHANGELOG.md: added 4.3.7 release notes

lib/ccs

@@ -2,7 +2,7 @@
 set -euo pipefail
 
 # Version (updated by scripts/bump-version.sh)
-CCS_VERSION="4.3.6"
+CCS_VERSION="4.3.7"
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 readonly CONFIG_FILE="${CCS_CONFIG:-$HOME/.ccs/config.json}"
 readonly PROFILES_JSON="$HOME/.ccs/profiles.json"

lib/ccs.ps1

@@ -12,7 +12,7 @@ param(
 $ErrorActionPreference = "Stop"
 
 # Version (updated by scripts/bump-version.sh)
-$CcsVersion = "4.3.6"
+$CcsVersion = "4.3.7"
 $ScriptDir = Split-Path -Parent $MyInvocation.MyCommand.Path
 $ConfigFile = if ($env:CCS_CONFIG) { $env:CCS_CONFIG } else { "$env:USERPROFILE\.ccs\config.json" }
 $ProfilesJson = "$env:USERPROFILE\.ccs\profiles.json"