fix: restore Google as default provider when multiple keys available

EXTEND.md default_provider still takes priority over auto-detect.
Priority: CLI --provider > EXTEND.md default_provider > auto-detect (Google first).

skills/baoyu-image-gen/SKILL.md

@@ -204,7 +204,7 @@ ${BUN_X} {baseDir}/scripts/main.ts --prompt "A cat" --image out.png --provider r
 1. `--ref` provided + no `--provider` → auto-select Google first, then OpenAI, then Replicate
 2. `--provider` specified → use it (if `--ref`, must be `google`, `openai`, or `replicate`)
 3. Only one API key available → use that provider
-4. Multiple available → default to Replicate (`google/nano-banana-pro`)
+4. Multiple available → default to Google
 
 ## Quality Presets
 

skills/baoyu-image-gen/scripts/main.ts

@@ -546,17 +546,17 @@ function detectProvider(args: CliArgs): Provider {
   }
 
   const available = [
-    hasReplicate && "replicate",
     hasGoogle && "google",
     hasOpenai && "openai",
     hasDashscope && "dashscope",
+    hasReplicate && "replicate",
   ].filter(Boolean) as Provider[];
 
   if (available.length === 1) return available[0]!;
   if (available.length > 1) return available[0]!;
 
   throw new Error(
-    "No API key found. Set REPLICATE_API_TOKEN, GOOGLE_API_KEY, GEMINI_API_KEY, OPENAI_API_KEY, or DASHSCOPE_API_KEY.\n" +
+    "No API key found. Set GOOGLE_API_KEY, GEMINI_API_KEY, OPENAI_API_KEY, DASHSCOPE_API_KEY, or REPLICATE_API_TOKEN.\n" +
       "Create ~/.baoyu-skills/.env or <cwd>/.baoyu-skills/.env with your keys."
   );
 }