feat(cli-settings): support multi-provider settings for Claude, Codex, and Gemini

Decouple CLI settings architecture from Claude-only to support multiple
providers. Each provider has independent settings UI and backend handling.

- Add CliProvider type discriminator ('claude' | 'codex' | 'gemini')
- Add CodexCliSettings (profile, authJson, configToml) and GeminiCliSettings types
- Update EndpointSettings with provider field (defaults 'claude' for backward compat)
- Refactor CliSettingsModal with provider selector and provider-specific forms
- Remove includeCoAuthoredBy field across all layers
- Extend CliConfigModal to show Config Profile for all tools (not just claude)
- Add provider-aware argument injection in cli-session-manager (--settings/--profile/env)
- Rename addClaudeCustomEndpoint to addCustomEndpoint (old name kept as deprecated alias)
- Replace providerBasedCount/directCount with per-provider counts in useCliSettings hook
- Update CliSettingsList with provider badges and per-provider stat cards
- Add Codex and Gemini test cases for validateSettings and createDefaultSettings

ccw/src/tools/claude-cli-tools.ts

@@ -859,12 +859,12 @@ export function removeClaudeApiEndpoint(
 }
 
 /**
- * @deprecated Use addClaudeApiEndpoint instead
- * Adds tool to config based on tags:
+ * Add a custom CLI settings endpoint tool to cli-tools.json
+ * Adds tool based on tags:
  * - cli-wrapper tag -> type: 'cli-wrapper'
  * - others -> type: 'api-endpoint'
  */
-export function addClaudeCustomEndpoint(
+export function addCustomEndpoint(
   projectDir: string,
   endpoint: { id: string; name: string; enabled: boolean; tags?: string[]; availableModels?: string[]; settingsFile?: string }
 ): ClaudeCliToolsConfig {
@@ -895,10 +895,13 @@ export function addClaudeCustomEndpoint(
   return config;
 }
 
+/** @deprecated Use addCustomEndpoint instead */
+export const addClaudeCustomEndpoint = addCustomEndpoint;
+
 /**
  * Remove endpoint tool (cli-wrapper or api-endpoint)
  */
-export function removeClaudeCustomEndpoint(
+export function removeCustomEndpoint(
   projectDir: string,
   endpointId: string
 ): ClaudeCliToolsConfig {
@@ -918,6 +921,9 @@ export function removeClaudeCustomEndpoint(
   return config;
 }
 
+/** @deprecated Use removeCustomEndpoint instead */
+export const removeClaudeCustomEndpoint = removeCustomEndpoint;
+
 /**
  * Get config source info
  */