Add set_model_power no-op stub to TempControllerBase

The Normal controller had no set_model_power(), causing callers to
guard with hasattr() instead of relying on a stable interface. Adding a
no-op stub to the base class means all controllers have the method;
TempControllerSmith overrides it to actually update its internal model.
Remove the now-redundant hasattr guards at both call sites.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Tqxrk8uj4M3w3d3eXm3xK8

components/pid/temp_controller_base.py

@@ -89,6 +89,9 @@ class TempControllerBase(APid):
 	def post_pid(self):
 		pass
 
+	def set_model_power(self, power):
+		pass
+
 	def set_theta_ist(self, value):
 		self.theta_ist_set = value
 		if self.is_startup: