feat: add positron/osupad keyboard

Author: juarendra

keyboards/positron/osupad/keyboard.json

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+{
+  "manufacturer": "Positron Electronic",
+  "keyboard_name": "OSUpad",
+  "maintainer": "juarendra",
+  "url": "https://www.tokopedia.com/positronelectronic",
+  "development_board": "bluepill",
+  "diode_direction": "COL2ROW",
+  "matrix_pins": {
+    "direct": [
+      ["B0", "A7", "A6"],
+      ["B12", "B13", "B14"]
+    ]
+  },
+  "usb": {
+    "device_version": "1.0.0",
+    "pid": "0x7050",
+    "vid": "0x1209"
+  },
+  "features": {
+    "bootmagic": true,
+    "extrakey": true,
+    "mousekey": true,
+    "nkro": true,
+    "rgblight": true
+  },
+  "rgblight": {
+    "led_count": 8,
+    "animations": {
+      "alternating": true,
+      "breathing": true,
+      "christmas": true,
+      "knight": true,
+      "rainbow_mood": true,
+      "rainbow_swirl": true,
+      "rgb_test": true,
+      "snake": true,
+      "static_gradient": true
+    }
+  },
+  "ws2812": {
+    "pin": "A5"
+  },
+  "layouts": {
+    "LAYOUT": {
+      "layout": [
+        {"matrix": [0, 0], "x": 0, "y": 0},
+        {"matrix": [0, 1], "x": 1, "y": 0},
+        {"matrix": [0, 2], "x": 2, "y": 0},
+        {"matrix": [1, 0], "x": 0, "y": 1},
+        {"matrix": [1, 1], "x": 1, "y": 1},
+        {"matrix": [1, 2], "x": 2, "y": 1}
+      ]
+    }
+  }
+}

keyboards/positron/osupad/keymaps/default/keymap.c

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+// Copyright 2024-2026 Juarendra Ramadhani (@juarendra)
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include QMK_KEYBOARD_H
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+    [0] = LAYOUT(KC_A, KC_B, KC_C, KC_E, KC_F, KC_G),
+    [1] = LAYOUT(KC_Q, KC_W, KC_X, KC_Z, KC_Y, KC_U),
+    [2] = LAYOUT(KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO),
+    [3] = LAYOUT(KC_RGHT, KC_UP, KC_DOWN, KC_LEFT, KC_SPC, KC_ESC),
+};

keyboards/positron/osupad/readme.md

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+# Positron OSUpad
+
+![Positron OSUpad](https://raw.githubusercontent.com/juarendra/OSUpad-QMK-VIA/main/DOC/HARDWARE/asli1.jpeg)
+
+A 2x3 hotswap mechanical macropad with RGB lighting, designed for rhythm gamers.
+
+- Keyboard Maintainer: [Juarendra Ramadhani](https://github.com/juarendra)
+- Hardware Supported: Positron OSUpad (STM32F103)
+- Hardware Availability: [Positron Electronic](https://www.tokopedia.com/positronelectronic)
+
+Make example for this keyboard (after setting up your build environment):
+
+    qmk compile -kb positron/osupad -km default
+
+Flashing example for this keyboard:
+
+    qmk flash -kb positron/osupad -km default
+
+See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).
+
+## Bootloader
+
+Enter the bootloader using Bootmagic reset: hold the top-left key while plugging in the keyboard.