The nvngx.dll bundled from the OptiScaler v0.7.8-pre0 nightly was the
real NVIDIA DLSS 3.10.3 production runtime (47 MB).  Inspection of its
PE export table showed it is missing 18 NVSDK_NGX_* symbols introduced
in DLSS SDK 3.1+ that every modern DLSS-enabled title calls at init:

  NVSDK_NGX_D3D12_AllocateParameters / DestroyParameters
  NVSDK_NGX_D3D12_GetCapabilityParameters / GetParameters
  NVSDK_NGX_D3D12_Init_with_ProjectID / Init_ProjectID
  NVSDK_NGX_UpdateFeature
  (plus D3D11 and Vulkan equivalents)

OptiScaler 0.9.0-final's own NGX proxy layer exports all of these and
handles all NGX interception internally.  Shipping the bare NVIDIA DLL
alongside it caused export-not-found failures on Proton when any code
path bypassed OptiScaler's hooks and resolved directly against the file.
The OptiScaler 0.9.0-final release notes also explicitly advise Linux
users to delete nvngx.dll when upgrading.

Changes:
- package.json: remove nvngx.dll from remote_binary download list
- main.py SUPPORT_FILES: remove nvngx.dll (no longer staged to fgmod/)
- main.py extract_static_optiscaler: remove nvngx.dll from additional_files;
  add explanatory comment for future reference
- main.py check_fgmod_path: remove nvngx.dll from required-file check
- fgmod.sh: remove the cp line that deployed nvngx.dll into game dirs

nvngx.dll is intentionally kept in INJECTOR_FILENAMES (main.py) and in
the fgmod.sh pre-patch rm and fgmod-uninstaller.sh cleanup so that any
copy placed by a previous plugin version is swept from game directories
on the next patch or uninstall.

Expose the proxy DLL rename as a user-selectable option across all
injection paths.  Previously hardcoded to dxgi.dll with no way to
change it short of manually prepending DLL=<name> to the Steam launch
option.

src/utils/constants.ts
- Add PROXY_DLL_OPTIONS (7 entries matching _create_renamed_copies)
  each with a label and one-line hint
- Add DEFAULT_PROXY_DLL constant (dxgi.dll) and ProxyDllValue type

src/api/index.ts
- runManualPatch now takes [directory, dll_name] so the chosen name
  reaches the backend

src/components/OptiScalerControls.tsx
- Own dllName state (default: dxgi.dll)
- Render a DropdownItem (visible when installed) showing the 7 options
  with the selected option's hint as the description
- Pass dllName down to both ClipboardCommands and ManualPatchControls

src/components/ClipboardCommands.tsx
- Accept dllName prop
- Patch command is plain ~/fgmod/fgmod %command% for the default;
  prefixed DLL=<name> ~/fgmod/fgmod %command% for any other choice

src/components/CustomPathOverride.tsx
- Accept dllName prop
- Pass it to runManualPatch
- Manual launch cmd clipboard button builds
  WINEDLLOVERRIDES="<stem>=n,b" dynamically; emits bare
  SteamDeck=0 %command% for OptiScaler.asi (ASI loader path needs no
  Wine DLL override)

main.py
- Add VALID_DLL_NAMES set (whitelist matching the renames dir)
- manual_patch_directory validates dll_name against the whitelist and
  returns an error for unknown values
- _manual_patch_directory_impl accepts dll_name param; removes the
  hardcoded "dxgi.dll" line

defaults/assets/fgmod.sh
- Fix longstanding bug: WINEDLLOVERRIDES was hardcoded to dxgi=n,b
  regardless of the DLL= env var selection.  Now derives the stem from
  $dll_name and skips the override entirely for .asi files.