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/frodo.yml

@@ -57,6 +57,7 @@ files:
     system: commodore-c64
     description: "C64 BASIC V2 ROM"
     required: false
+    hle_fallback: true
     embedded: true
     size: 8192
     note: "Embedded as builtin_basic_rom[] in Basic_ROM.h. External file never loaded in practice (DATADIR is empty, path is bare filename in cwd)."
@@ -66,6 +67,7 @@ files:
     system: commodore-c64
     description: "C64 Kernal ROM"
     required: false
+    hle_fallback: true
     embedded: true
     size: 8192
     note: "Embedded as builtin_kernal_rom[] in Kernal_ROM.h. Patched at runtime for fast reset and 1541 IEC traps."
@@ -75,6 +77,7 @@ files:
     system: commodore-c64
     description: "C64 Character Generator ROM"
     required: false
+    hle_fallback: true
     embedded: true
     size: 4096
     note: "Embedded as builtin_char_rom[] in Char_ROM.h. Used by VIC-II for text/bitmap rendering."
@@ -84,6 +87,7 @@ files:
     system: commodore-c64
     description: "Commodore 1541 floppy drive ROM"
     required: false
+    hle_fallback: true
     embedded: true
     size: 16384
     note: "Embedded as builtin_drive_rom[] in 1541_ROM.h. Patched at runtime to disable checksum and trap disk I/O."