feat: Switch to osu-native pp calculator

[cyperdark]

• cleanup
• cleanup again
• testing
• fix converted beatmaps
• add support for mod settings
• get ar, od, hp, cs from somewhere
• fix whatever is this

other notes from gabu:

• The endpoint /api/calculate/pp is broken
• hitWindow undefined
• strains still use rosu
• do not forget about ppDifficulty
• should check for race issues with this.isCalculating == false

[GabuTheDev]

I've done a test on the current state (cfe81e9)

1. tosu crashes on lazer replay rewind

not always though, small rewinds seem fine sometimes? big rewinds clearly crash the program.
there might be something else crashing it, like maybe mid-calc rewind or something, idk.

Exit code 3221225477 (which is 0xC0000005 in hexadecimal) is a Windows-specific error indicating an Access Violation. This occurs when a process attempts to read or write to a memory address it does not have permission to access.

Command failed with exit code 3221225477

2. pp is unfortunately off

On both clients, it never overshoot. The values were always under the actual pp value.

stable: Differences are not that big, they're certainly better than lazer's.
lazer: it seems like on lazer, besides the problem that is probably also present on stable, the pp value is heavily influenced by sliders.

Bm	huis		tosu stable	Diff stable		tosu lazer	Diff lazer		Notes
#	324.713		306.69	-18.02		314.75	-9.96		none
#	3015.862		3010.11	-5.75		834.09	-2181.77		none
#	5512.123		5500.23	-11.89		264.69	-5247.43		none
#	910.676		910.68	0.00		910.68	0.00		sliders=0

Diff was calc as such: tosu_pp - rounded(huis_pp, 2 decimal)

3. Beatmap is sometimes accessed before initialization.

it only errors once, then magically works after that.
Cannot read properties of undefined (reading 'Beatmap')

4. The default intro song is no longer skipped.

also I am not sure if it's supposed to be the same value at all accuracies.....

5. pp is updated on 2nd note, instead of 1st.

see video:

Screenshot.2026-02-26.212213.mp4

[cyperdark]

1. fixed

[cyperdark]

3. fixed (probably

[cyperdark]

4. lazer doesnt say it's a intro music or not

[GabuTheDev]

lazer doesnt say it's a intro music or not

is there no beatmap id? can we not hardcode skip by beatmap id?

[cyperdark]

5. fixed also re:fixed 1.