chore: remove orphan images and PDFs (no longer referenced)

Deleted 10 orphan image directories (HDPE, backup_originals,
portfolio/.omc, products-raw/ball-jet, products-raw/pipe-insulation,
products-raw/tevada, dukelarrsen, mech, อุปกรณ์ดับเพลิง,
อุปกรณ์ปรับอากาศ) and 3 orphan PDFs (Maxflex tube, SANWA,
novat-old) — all confirmed to have 0 references in src/.

public/images/products-raw/ball-jet/ball-jet.svg

@@ -1,10 +0,0 @@
-<svg xmlns="http://www.w3.org/2000/svg" width="400" height="400" viewBox="0 0 400 400">
-  <rect width="400" height="400" fill="#0ea5e9"/>
-  <text x="200" y="100" text-anchor="middle" fill="white" font-family="sans-serif" font-size="24" font-weight="600">หัวจ่ายแอร์</text>
-  <rect x="100" y="180" width="200" height="140" rx="8" fill="none" stroke="white" stroke-width="6"/>
-  <line x1="120" y1="200" x2="120" y2="300" stroke="white" stroke-width="3"/>
-  <line x1="160" y1="200" x2="160" y2="300" stroke="white" stroke-width="3"/>
-  <line x1="200" y1="200" x2="200" y2="300" stroke="white" stroke-width="3"/>
-  <line x1="240" y1="200" x2="240" y2="300" stroke="white" stroke-width="3"/>
-  <line x1="280" y1="200" x2="280" y2="300" stroke="white" stroke-width="3"/>
-</svg>

public/images/products-raw/pipe-insulation/Insulte_06.svg

@@ -1 +0,0 @@
-<svg xmlns="http://www.w3.org/2000/svg" width="400" height="300" viewBox="0 0 400 300"><rect width="400" height="300" fill="#f97316"/><text x="200" y="150" text-anchor="middle" fill="white" font-family="sans-serif" font-size="18">Insulation</text></svg>

public/images/products-raw/pipe-insulation/Insulte_07.svg

@@ -1 +0,0 @@
-<svg xmlns="http://www.w3.org/2000/svg" width="400" height="300" viewBox="0 0 400 300"><rect width="400" height="300" fill="#f97316"/><text x="200" y="150" text-anchor="middle" fill="white" font-family="sans-serif" font-size="18">Insulation</text></svg>

public/images/products-raw/tevada/tevada.svg

@@ -1,11 +0,0 @@
-<svg xmlns="http://www.w3.org/2000/svg" width="400" height="400" viewBox="0 0 400 400">
-  <rect width="400" height="400" fill="#16a34a"/>
-  <text x="200" y="100" text-anchor="middle" fill="white" font-family="sans-serif" font-size="24" font-weight="600">รั้วเทวดา</text>
-  <line x1="80" y1="300" x2="80" y2="180" stroke="white" stroke-width="6"/>
-  <line x1="140" y1="300" x2="140" y2="180" stroke="white" stroke-width="6"/>
-  <line x1="200" y1="300" x2="200" y2="180" stroke="white" stroke-width="6"/>
-  <line x1="260" y1="300" x2="260" y2="180" stroke="white" stroke-width="6"/>
-  <line x1="320" y1="300" x2="320" y2="180" stroke="white" stroke-width="6"/>
-  <line x1="80" y1="220" x2="320" y2="220" stroke="white" stroke-width="4"/>
-  <line x1="80" y1="260" x2="320" y2="260" stroke="white" stroke-width="4"/>
-</svg>