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/nestopia.yml

@@ -53,6 +53,7 @@ files:
     system: nintendo-nes
     description: "Nestopia game database for region and mapper autodetection"
     required: false
+    hle_fallback: true
     size: 1022369
     md5: "0ee6cbdc6f5c96ce9c8aa5edb59066f4"
     sha1: ~
@@ -64,6 +65,7 @@ files:
     system: nintendo-nes
     description: "External NES color palette"
     required: false
+    hle_fallback: true
     size: 192
     md5: ~
     sha1: ~