chore: tidy repo - DESIGN.md & scoring rules into docs/, icon generators into tools/, drop one-off junk, refresh app README

tools/gen_icons.py

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+
+# -*- coding: utf-8 -*-
+# 生成 Footprints 应用图标：品牌蓝圆角方块 + 白色抽象足迹
+from PIL import Image, ImageDraw
+import os
+
+OUT = os.path.join(os.path.dirname(os.path.abspath(__file__)), '..', 'app', 'src-tauri', 'icons')
+os.makedirs(OUT, exist_ok=True)
+
+BRAND = (48, 86, 211)
+BRAND_DARK = (35, 62, 160)
+
+def make(size):
+    ss = size * 4  # 超采样抗锯齿
+    img = Image.new('RGBA', (ss, ss), (0, 0, 0, 0))
+    d = ImageDraw.Draw(img)
+    radius = ss // 5
+    # 背景圆角方块（上浅下深的纵向渐变）
+    grad = Image.new('RGBA', (ss, ss), (0, 0, 0, 0))
+    gd = ImageDraw.Draw(grad)
+    for y in range(ss):
+        t = y / ss
+        c = tuple(int(BRAND[i] + (BRAND_DARK[i] - BRAND[i]) * t) for i in range(3)) + (255,)
+        gd.line([(0, y), (ss, y)], fill=c)
+    mask = Image.new('L', (ss, ss), 0)
+    md = ImageDraw.Draw(mask)
+    md.rounded_rectangle([0, 0, ss - 1, ss - 1], radius=radius, fill=255)
+    img.paste(grad, (0, 0), mask)
+    # 抽象足迹：前掌大椭圆 + 后跟小椭圆
+    white = (255, 255, 255, 240)
+    d.ellipse([ss*0.24, ss*0.16, ss*0.60, ss*0.62], fill=white)   # 前掌
+    d.ellipse([ss*0.56, ss*0.58, ss*0.86, ss*0.84], fill=(255, 255, 255, 200))  # 后跟
+    return img.resize((size, size), Image.LANCZOS)
+
+for name, size in [('32x32.png', 32), ('128x128.png', 128), ('128x128@2x.png', 256), ('icon.png', 512)]:
+    make(size).save(os.path.join(OUT, name))
+
+ico_sizes = [16, 24, 32, 48, 64, 128, 256]
+imgs = [make(s) for s in ico_sizes]
+imgs[-1].save(os.path.join(OUT, 'icon.ico'), format='ICO', sizes=[(s, s) for s in ico_sizes])
+print('icons generated:', os.listdir(OUT))

tools/gen_pwa_icons.py

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+
+# -*- coding: utf-8 -*-
+from PIL import Image, ImageDraw
+import os
+
+OUT = os.path.join(os.path.dirname(os.path.abspath(__file__)), '..', 'app', 'public', 'icons')
+os.makedirs(OUT, exist_ok=True)
+BRAND = (48, 86, 211)
+BRAND_DARK = (35, 62, 160)
+
+def make(size, safe=1.0):
+    ss = size * 4
+    img = Image.new('RGBA', (ss, ss), (0, 0, 0, 0))
+    grad = Image.new('RGBA', (ss, ss), (0, 0, 0, 0))
+    gd = ImageDraw.Draw(grad)
+    for y in range(ss):
+        t = y / ss
+        c = tuple(int(BRAND[i] + (BRAND_DARK[i] - BRAND[i]) * t) for i in range(3)) + (255,)
+        gd.line([(0, y), (ss, y)], fill=c)
+    mask = Image.new('L', (ss, ss), 0)
+    ImageDraw.Draw(mask).rounded_rectangle([0, 0, ss - 1, ss - 1], radius=ss // 5, fill=255)
+    img.paste(grad, (0, 0), mask)
+    d = ImageDraw.Draw(img)
+    white = (255, 255, 255, 240)
+    # safe 缩放：maskable 时内容收缩到中心 70% 区域
+    cx, cy, k = ss / 2, ss / 2, safe
+    d.ellipse([cx - 0.18*ss*k, cy - 0.34*ss*k, cx + 0.18*ss*k, cy + 0.10*ss*k], fill=white)
+    d.ellipse([cx + 0.03*ss*k, cy + 0.08*ss*k, cx + 0.33*ss*k, cy + 0.34*ss*k], fill=(255, 255, 255, 200))
+    return img.resize((size, size), Image.LANCZOS)
+
+make(192).save(os.path.join(OUT, 'pwa-192.png'))
+make(512).save(os.path.join(OUT, 'pwa-512.png'))
+make(512, safe=0.7).save(os.path.join(OUT, 'maskable-512.png'))
+print('pwa icons:', os.listdir(OUT))