Add card images for sets a1 and a1a

Add ~90 card artwork webp files and a MISSING_IMAGES.json tracking file
for cards still needing artwork.

backend/data/images/MISSING_IMAGES.json

@@ -0,0 +1,113 @@
+{
+  "generated": "2026-01-31",
+  "summary": {
+    "total_definitions": 382,
+    "total_images": 335,
+    "missing_count": 47,
+    "coverage_pct": 87.7
+  },
+  "missing_by_set": {
+    "a1": [
+      "a1-030-lilligant",
+      "a1-052-centiskorch",
+      "a1-087-froakie",
+      "a1-091-bruxish",
+      "a1-110-helioptile",
+      "a1-112-pincurchin",
+      "a1-118-slowpoke",
+      "a1-121-haunter",
+      "a1-137-sandshrew",
+      "a1-139-diglett",
+      "a1-144-machoke",
+      "a1-164-ekans",
+      "a1-169-nidoran",
+      "a1-170-nidorino",
+      "a1-179-pawniard",
+      "a1-180-bisharp",
+      "a1-186-pidgey",
+      "a1-187-pidgeotto",
+      "a1-193-jigglypuff",
+      "a1-196-meowth",
+      "a1-207-eevee",
+      "a1-209-porygon",
+      "a1-213-cinccino",
+      "a1-216-helix-fossil",
+      "a1-217-dome-fossil"
+    ],
+    "a1a": [
+      "a1a-020-finneon",
+      "a1a-033-sigilyph",
+      "a1a-040-slurpuff",
+      "a1a-041-mankey",
+      "a1a-042-primeape",
+      "a1a-050-weezing",
+      "a1a-051-purrloin",
+      "a1a-052-liepard",
+      "a1a-054-whirlipede",
+      "a1a-057-pidgey",
+      "a1a-058-pidgeotto",
+      "a1a-064-pokemon-flute"
+    ],
+    "energy": [
+      "energy-basic-colorless",
+      "energy-basic-darkness",
+      "energy-basic-dragon",
+      "energy-basic-fighting",
+      "energy-basic-fire",
+      "energy-basic-grass",
+      "energy-basic-lightning",
+      "energy-basic-metal",
+      "energy-basic-psychic",
+      "energy-basic-water"
+    ]
+  },
+  "missing_cards": [
+    "a1-030-lilligant",
+    "a1-052-centiskorch",
+    "a1-087-froakie",
+    "a1-091-bruxish",
+    "a1-110-helioptile",
+    "a1-112-pincurchin",
+    "a1-118-slowpoke",
+    "a1-121-haunter",
+    "a1-137-sandshrew",
+    "a1-139-diglett",
+    "a1-144-machoke",
+    "a1-164-ekans",
+    "a1-169-nidoran",
+    "a1-170-nidorino",
+    "a1-179-pawniard",
+    "a1-180-bisharp",
+    "a1-186-pidgey",
+    "a1-187-pidgeotto",
+    "a1-193-jigglypuff",
+    "a1-196-meowth",
+    "a1-207-eevee",
+    "a1-209-porygon",
+    "a1-213-cinccino",
+    "a1-216-helix-fossil",
+    "a1-217-dome-fossil",
+    "a1a-020-finneon",
+    "a1a-033-sigilyph",
+    "a1a-040-slurpuff",
+    "a1a-041-mankey",
+    "a1a-042-primeape",
+    "a1a-050-weezing",
+    "a1a-051-purrloin",
+    "a1a-052-liepard",
+    "a1a-054-whirlipede",
+    "a1a-057-pidgey",
+    "a1a-058-pidgeotto",
+    "a1a-064-pokemon-flute",
+    "energy-basic-colorless",
+    "energy-basic-darkness",
+    "energy-basic-dragon",
+    "energy-basic-fighting",
+    "energy-basic-fire",
+    "energy-basic-grass",
+    "energy-basic-lightning",
+    "energy-basic-metal",
+    "energy-basic-psychic",
+    "energy-basic-water"
+  ]
+}