fix: standardize log prefixes, remove duplicates, add missing module tags

Second-pass logging cleanup: consistent [LEVEL] [module] format across
all 41 files. Remove stale prefixes ([CF], [SYNC], [SCHED], [API],
[STORAGE], [HEALTH], [ROLLBACK]). Remove 5 duplicate log lines. Gate
ungated DEBUG lines. Fix wrong log levels (restore start WARN→INFO).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

controller/internal/cloudflare/client.go

@@ -64,10 +64,10 @@ func (c *Client) do(ctx context.Context, method, path string, body interface{})
 		}
 		bodyReader = bytes.NewReader(data)
 		if c.debug {
-			c.logger.Printf("[CF-DEBUG] %s %s body=%s", method, path, string(data))
+			c.logger.Printf("[DEBUG] [cloudflare] %s %s body=%s", method, path, string(data))
 		}
 	} else if c.debug {
-		c.logger.Printf("[CF-DEBUG] %s %s", method, path)
+		c.logger.Printf("[DEBUG] [cloudflare] %s %s", method, path)
 	}
 
 	url := apiBase + path
@@ -91,7 +91,7 @@ func (c *Client) do(ctx context.Context, method, path string, body interface{})
 	}
 
 	if c.debug {
-		c.logger.Printf("[CF-DEBUG] Response %d: %s", resp.StatusCode, string(respBody))
+		c.logger.Printf("[DEBUG] [cloudflare] Response %d: %s", resp.StatusCode, string(respBody))
 	}
 
 	var apiResp apiResponse