feat: hle_fallback on 39 emulator profiles (266 entries)

Batch analysis of all 273 profiles to identify HLE/embedded
fallbacks. Added hle_fallback: true where the core has verified
software replacement for missing BIOS files:

- Embedded ROMs: vice (102), ep128emu (22), fuse (18), frodo (4)
- HLE BIOS: bsnes* (33 across 3 profiles), puae (9 AROS),
  noods (4), melonds* (6 FreeBIOS), flycast (3 reios)
- Open-source replacements: sameboy (8), pokemini (1), gpsp (1)
- Built-in fallbacks: np2kai (7), atari800 (6 Altirra),
  picodrive (3), quasi88 (4), gambatte (2)

Conservative: only added where notes or source code confirm HLE.
Skipped 50+ profiles where files are optional alternatives, not
HLE replaceable (neocd, opera, kronos, pcem, etc.)

emulators/atari800.yml

@@ -33,6 +33,7 @@ files:
   - name: "5200.rom"
     path: "5200.rom"
     required: false
+    hle_fallback: true
     size: 2048
     md5: 281f20ea4320404ec820fb7ec0693b38
     note: >
@@ -50,6 +51,7 @@ files:
   - name: "ATARIBAS.ROM"
     path: "ATARIBAS.ROM"
     required: false
+    hle_fallback: true
     size: 8192
     md5: 0bac0c6a50104045d902df4503a4c30b
     note: >
@@ -65,6 +67,7 @@ files:
   - name: "ATARIOSA.ROM"
     path: "ATARIOSA.ROM"
     required: false
+    hle_fallback: true
     size: 10240
     md5: eb1f32f5d9f382db1bbfb8d7f9cb343a
     note: >
@@ -79,6 +82,7 @@ files:
   - name: "ATARIOSB.ROM"
     path: "ATARIOSB.ROM"
     required: false
+    hle_fallback: true
     size: 10240
     md5: 4177f386a3bac989a981d3fe3388cb6c
     crc32: 0e86d61d
@@ -101,6 +105,7 @@ files:
   - name: "ATARIXL.ROM"
     path: "ATARIXL.ROM"
     required: false
+    hle_fallback: true
     size: 16384
     md5: 06daac977823773a3eea3422fd26a703
     note: >
@@ -115,6 +120,7 @@ files:
   - name: "BB01R4_OS.ROM"
     path: "BB01R4_OS.ROM"
     required: false
+    hle_fallback: true
     size: 16384
     md5: b7a2a04677d34f069eeb643d5238bf86
     note: >