feat: Address multiple open issues (#32, #30, #26, #19)

Issue #32 - Unknown command errors:
- Register get_board_extents in command_routes (was implemented but not registered)
- Implement find_component command with pattern matching on reference/value/footprint
- Add schemas for both commands

Issue #30 - PCB routing replication (Phase 1):
- Implement get_component_pads: returns all pads with positions, nets, shapes
- Implement get_pad_position: returns specific pad coordinates and properties
- Implement query_traces: query traces by net, layer, or bounding box
- Add schemas for all new commands

Issue #26 - Schematic workflow:
- Add missing schemas for add_schematic_connection, add_schematic_net_label,
  connect_to_net, get_net_connections, and generate_netlist

Issue #19 - macOS Python path detection:
- Add Python 3.13 to version detection
- Add alternative KiCAD installation paths (user Applications, capitalization variants)
- Add Homebrew Python fallback paths for Apple Silicon and Intel Macs
- Expand platform_helper.py with same improvements

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

python/kicad_interface.py

@@ -288,6 +288,7 @@ class KiCADInterface:
             "get_board_info": self.board_commands.get_board_info,
             "get_layer_list": self.board_commands.get_layer_list,
             "get_board_2d_view": self.board_commands.get_board_2d_view,
+            "get_board_extents": self.board_commands.get_board_extents,
             "add_board_outline": self.board_commands.add_board_outline,
             "add_mounting_hole": self.board_commands.add_mounting_hole,
             "add_text": self.board_commands.add_text,
@@ -301,6 +302,9 @@ class KiCADInterface:
             "edit_component": self.component_commands.edit_component,
             "get_component_properties": self.component_commands.get_component_properties,
             "get_component_list": self.component_commands.get_component_list,
+            "find_component": self.component_commands.find_component,
+            "get_component_pads": self.component_commands.get_component_pads,
+            "get_pad_position": self.component_commands.get_pad_position,
             "place_component_array": self.component_commands.place_component_array,
             "align_components": self.component_commands.align_components,
             "duplicate_component": self.component_commands.duplicate_component,
@@ -310,6 +314,7 @@ class KiCADInterface:
             "route_trace": self.routing_commands.route_trace,
             "add_via": self.routing_commands.add_via,
             "delete_trace": self.routing_commands.delete_trace,
+            "query_traces": self.routing_commands.query_traces,
             "get_nets_list": self.routing_commands.get_nets_list,
             "create_netclass": self.routing_commands.create_netclass,
             "add_copper_pour": self.routing_commands.add_copper_pour,