Add profile system for automatic target activation

Profiles monitor running processes and foreground windows to
automatically start/stop targets when conditions are met.
Includes profile engine, platform detector (WMI), REST API,
process browser endpoint, and calibration persistence fix.

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

server/src/wled_controller/api/schemas/system.py

@@ -40,3 +40,10 @@ class DisplayListResponse(BaseModel):
 
     displays: List[DisplayInfo] = Field(description="Available displays")
     count: int = Field(description="Number of displays")
+
+
+class ProcessListResponse(BaseModel):
+    """List of running processes."""
+
+    processes: List[str] = Field(description="Sorted list of unique process names")
+    count: int = Field(description="Number of unique processes")