feat: add footprint + symbol creator tools

Footprint tools:
- create_footprint: generates .kicad_mod via f-string (SMD/THT, courtyard, silkscreen, fab)
- edit_footprint_pad: updates size/position/drill/shape in-place
- list_footprint_libraries: scans .pretty directories
- register_footprint_library: adds entry to fp-lib-table

Symbol tools:
- create_symbol: generates .kicad_sym with pins, rectangles, polylines
- delete_symbol: removes symbol from library
- list_symbols_in_library: lists all symbols in a .kicad_sym file
- register_symbol_library: adds entry to sym-lib-table

Also:
- Fix footprint format version: 20250114 (schematic) -> 20241229 (footprint)
- Two MCP prompts: create_footprint_guide + footprint_ipc_checklist

Live tested: TMC2209 footprint (19 pads), R_0603_Test, edit_footprint_pad,
TMC2209_Custom symbol with pins all confirmed in KiCAD 9

src/prompts/index.ts

@@ -1,9 +1,10 @@
-/**
- * Prompts index for KiCAD MCP server
- * 
- * Exports all prompt registration functions
- */
-
-export { registerComponentPrompts } from './component.js';
-export { registerRoutingPrompts } from './routing.js';
-export { registerDesignPrompts } from './design.js';
+/**
+ * Prompts index for KiCAD MCP server
+ *
+ * Exports all prompt registration functions
+ */
+
+export { registerComponentPrompts } from "./component.js";
+export { registerRoutingPrompts } from "./routing.js";
+export { registerDesignPrompts } from "./design.js";
+export { registerFootprintPrompts } from "./footprint.js";