feat(SNNBot): upgrade bot API, fix debug overlay and aiming lines

- Upgrade to robocode_tankroyale_botapi v1.0.7 (SVG viewBox fix)
- Fix Y-axis mirror in aiming line toXY helper
- Resize debug panel to half arena width/height
- Replace neuron boxes with barcode-style spike lines
- Thickness-encoded weight connections (all 216 lines)
- Add aiming line legend (top-left, white text)
- Dynamic aiming line length (distance + 50px overshoot)

SNNBot_garage/config.nims

@@ -0,0 +1,7 @@
+--path:"../common_libs"
+switch("outdir", "out")
+switch("path", thisDir() & "/src")
+# begin Nimble config (version 2)
+when withDir(thisDir(), system.fileExists("nimble.paths")):
+  include "nimble.paths"
+# end Nimble config