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/SNNBot.nimble

@@ -0,0 +1,12 @@
+# Package
+version       = "0.1.0"
+author        = "Davide Cappellini"
+description   = "SNN prototype — population-coded LIF neurons, aiming loop, no learning"
+license       = "MIT"
+srcDir        = "src"
+bin           = @["SNNBot"]
+
+# Dependencies
+requires "nim >= 2.0.0"
+requires "robocode_tankroyale_botapi >= 1.0.7"
+# radar_lock is vendored in-tree (common_libs/) and wired via config.nims --path