fix(cli): forward --yolo to TUI binary via DEEPSEEK_YOLO env

The CLI dispatcher accepted --yolo but only passed it to Exec(TuiPassthroughArgs),
not to the plain Run(RunArgs) path used for interactive sessions.

Fix: pass DEEPSEEK_YOLO=true env var to the TUI binary. The TUI already
reads this env var (matching DEEPSEEK_SANDBOX_MODE pattern) and sets
allow_shell + start_in_agent_mode + yolo.

Also adds yolo field to CliRuntimeOverrides and ResolvedRuntimeOptions
so the flag propagates through the full resolve chain.

.env.example

@@ -37,6 +37,7 @@
 # DEEPSEEK_APPROVAL_POLICY=on-request
 # DEEPSEEK_SANDBOX_MODE=workspace-write
 # DEEPSEEK_ALLOW_SHELL=true
+# DEEPSEEK_YOLO=true
 
 # Optional extension paths
 # DEEPSEEK_SKILLS_DIR=~/.deepseek/skills