feat: add Claude Code OAuth and Codex CLI as LLM providers (#1166)

* feat: add Claude Code OAuth and Codex CLI providers

Port of bytedance/deer-flow#1136 from @solanian's feat/cli-oauth-providers branch.\n\nCarries the feature forward on top of current main without the original CLA-blocked commit metadata, while preserving attribution in the commit message for review.

* fix: harden CLI credential loading

Align Codex auth loading with the current ~/.codex/auth.json shape, make Docker credential mounts directory-based to avoid broken file binds on hosts without exported credential files, and add focused loader tests.

* refactor: tighten codex auth typing

Replace the temporary Any return type in CodexChatModel._load_codex_auth with the concrete CodexCliCredential type after the credential loader was stabilized.

* fix: load Claude Code OAuth from Keychain

Match Claude Code's macOS storage strategy more closely by checking the Keychain-backed credentials store before falling back to ~/.claude/.credentials.json. Keep explicit file overrides and add focused tests for the Keychain path.

* fix: require explicit Claude OAuth handoff

* style: format thread hooks reasoning request

* docs: document CLI-backed auth providers

* fix: address provider review feedback

* fix: harden provider edge cases

* Fix deferred tools, Codex message normalization, and local sandbox paths

* chore: narrow PR scope to OAuth providers

* chore: remove unrelated frontend changes

* chore: reapply OAuth branch frontend scope cleanup

* fix: preserve upload guards with reasoning effort wiring

---------

Co-authored-by: Willem Jiang <willem.jiang@gmail.com>

frontend/src/core/threads/hooks.ts

@@ -372,6 +372,15 @@ export function useThreadStream({
               thinking_enabled: context.mode !== "flash",
               is_plan_mode: context.mode === "pro" || context.mode === "ultra",
               subagent_enabled: context.mode === "ultra",
+              reasoning_effort:
+                context.reasoning_effort ??
+                (context.mode === "ultra"
+                  ? "high"
+                  : context.mode === "pro"
+                    ? "medium"
+                    : context.mode === "thinking"
+                      ? "low"
+                      : undefined),
               thread_id: threadId,
             },
           },