BLOCK8 확인 구간 모델 도식 추가

docs/BLOCK8_기준모델.svg

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+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 650" role="img" aria-labelledby="title desc">
+  <title id="title">광터지하차도 BLOCK8 기준 모델 도식</title>
+  <desc id="desc">STA. 0K+319.010부터 STA. 0K+338.990까지 19.980미터 기준 구간을 입체 기준선으로 표시. 구조물 단면 형상은 확인되지 않았음.</desc>
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+    <marker id="arrow" markerWidth="10" markerHeight="10" refX="5" refY="5" orient="auto-start-reverse"><path d="M0 0 10 5 0 10Z" fill="#788f7c"/></marker>
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+  <text x="72" y="76" fill="#728579" font-family="sans-serif" font-size="16" font-weight="700" letter-spacing="2">광터지하차도 · BLOCK8</text>
+  <text x="72" y="126" fill="#263a32" font-family="sans-serif" font-size="34" font-weight="700">확인된 종단 기준 구간</text>
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+  <circle cx="938" cy="75" r="5" fill="#b58d4c"/>
+  <text x="954" y="80" fill="#927443" font-family="sans-serif" font-size="14">단면 형상 확인 필요</text>
+
+  <g stroke="#d8e2d9" stroke-width="1">
+    <path d="M130 430 890 430 1070 520 310 520Z" fill="#eef3ed"/>
+    <path d="M310 520V542M500 520V542M690 520V542M880 520V542M1070 520V542"/>
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+  <rect x="482" y="224" width="108" height="50" rx="25" fill="#fff" stroke="#dbe4d7"/>
+  <text x="536" y="255" text-anchor="middle" fill="#49694f" font-family="sans-serif" font-size="20" font-weight="700">19.980 m</text>
+  <text x="220" y="402" text-anchor="middle" fill="#566e5c" font-family="sans-serif" font-size="17" font-weight="700">STA. 0K+319.010</text>
+  <text x="850" y="402" text-anchor="middle" fill="#566e5c" font-family="sans-serif" font-size="17" font-weight="700">STA. 0K+338.990</text>
+
+  <g transform="translate(86 520)" font-family="sans-serif" font-size="13" fill="#788a7d" stroke="#849987" stroke-width="2">
+    <path d="M0 0H70"/><path d="M0 0V-44"/><path d="M0 0 37 22"/>
+    <text x="78" y="5" stroke="none">종단 구간</text><text x="-14" y="-52" stroke="none">EL 미연결</text><text x="43" y="42" stroke="none">평면 배치 미확정</text>
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+  <rect x="72" y="580" width="1056" height="42" rx="8" fill="#f8f3e8" stroke="#e6dcc7"/>
+  <text x="92" y="606" fill="#8d784e" font-family="sans-serif" font-size="14">이 도식은 측점 범위만 나타냅니다. 구조물 폭·높이·단면 윤곽은 근거 확인 전이라 모델에 포함하지 않았습니다.</text>
+</svg>