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/vba_m.yml

@@ -17,13 +17,16 @@ files:
   - name: gba_bios.bin
     system: nintendo-gba
     required: false
+    hle_fallback: true
     md5: a860e8c0b6d573d191e4ec7db1b1e4f6
     note: "optional, core option vbam_usebios must be On"
   - name: gb_bios.bin
     system: nintendo-gb
     required: false
+    hle_fallback: true
     md5: 32fbbd84168d3482956eb3c5051637f5
   - name: gbc_bios.bin
     system: nintendo-gbc
     required: false
+    hle_fallback: true
     md5: dbfce9db9deaa2567f6a84fde55f9680