Adds 5 new settings route handlers for CLIs introduced by plan 14 that
declare configType:"custom" and need automated config file persistence:
forge (~/.forge/config.toml), jcode (~/.jcode/config.json),
deepseek-tui (~/.config/deepseek-tui/config.toml),
smelt (~/.smelt/config.json), pi (~/.pi/config.json).
Also registers the 5 tools in cliRuntime.ts path table so
getCliPrimaryConfigPath() resolves their config paths correctly.
Each handler follows the established pattern: requireCliToolsAuth guard on
every exported method, Zod body validation on POST, buildErrorBody/
sanitizeErrorMessage on all error paths (Hard Rule #12), fs/promises only
(no exec/spawn — Hard Rule #13), saveCliToolLastConfigured on success.
Integration tests: 7 subtests per handler (401 without auth, 200 GET,
400 missing-baseUrl, 400 missing-model, 200 POST writes file, 200 DELETE,
error sanitization + no exec/spawn static audit).
