[Codec/Native] Real H.264 decode for sceVideodec2, fix TLS loader missing the main module (#824)

* [Codec/Native] Real H.264 decode for sceVideodec2, fix TLS loader missing the main module

sceVideodec2 was a capability-only stub: the game's video pipeline
worked end-to-end but never produced a picture, so intro/cinematic
videos stayed black even though playback "completed" without errors
(confirmed on Ghost of Yotei's intro cinematic).

- Videodec2Decoder: owns an FFmpeg H.264 session per decoder handle,
  running decode and presentation pacing on their own threads (never
  the guest thread) so a whole clip isn't decoded faster than it can
  be displayed. Converts to BGRA and submits straight to
  VulkanVideoPresenter, bypassing guest memory the same way the
  existing Bink2 path does.
- Videodec2Exports: wires the real decoder into
  sceVideodec2CreateDecoder/Decode/Flush/Reset/DeleteDecoder, falling
  back to the original no-picture stub whenever FFmpeg is unavailable
  or a given decoder failed to open.
- VulkanVideoPresenter: decoded frames were being dropped under a
  single "latest wins" slot the render loop didn't always poll in
  time before the next frame overwrote it. Queues pending video
  presentations the same way guest-image flips already are.
- DirectExecutionBackend: the TLS load patcher's one-shot scan missed
  the main game module when the entry point resolves to a separate
  bootstrap allocation, and never re-scanned lazily-committed pages
  patched in afterward -- both left FS:[0] TLS loads unpatched,
  causing an early mutex-spin boot stall (reproduced on Demon's
  Souls: stuck at import #256). Now scans both the entry point's own
  allocation and the standard PS5/PS4 image base, and re-scans each
  newly committed executable range as it's touched.

* [GUI] Add a toggle for SHARPEMU_FORCE_SUBMIT_ORPHAN_PREAMBLES

This flag already existed as an AGC workaround (forces queued GPU
command-buffer preambles through when their target queue never picks
them up, unblocking titles stuck on a WAIT_REG_MEM that never
signals) but was only reachable by setting the environment variable
by hand. Expose it as a checkbox next to the other env toggles, in
both the global Options panel and the per-game settings panel, so it
can be turned on for a specific title without touching a shell.

* [GUI] Add remaining language translations for the new env toggle

The previous commit only added the new key to en.json/fr.json,
relying on Localization's runtime fallback to English -- but
LocalizationTests.EmbeddedLanguages_ContainEveryEnglishOptionsKey
requires every Options.* key to exist in every embedded language
file, which broke CI on all three build jobs. Fills in the
remaining 13 languages.

src/SharpEmu.GUI/Languages/ja.json

@@ -149,6 +149,7 @@
   "Options.Env.Group.General": "一般",
   "Options.Env.RenderDoc.Desc": "RenderDoc のアプリ内 API を読み込み、エミュレーター内からフレームをキャプチャできるようにします。\nゲーム実行中に F10 を押すと 1 フレームをキャプチャします。保存先は user/logs/capture_logs/<TITLE_ID> です。\nRenderDoc のインストールが必要です。GPU が遅くなり一部のタイトルはハングするため、デバッグ時以外はオフのままにしてください。",
   "Options.Env.GuestImageCpuSync.Desc": "ゲーム自身の CPU コードが書き換えるゲスト表面を再アップロードします。\n通常はオフのままにしてください。CPU で描画した表面が画面に反映されないタイトルで有効にします。\n性能を犠牲にし、GTA V など一部のタイトルでは不具合が生じます。",
+  "Options.Env.ForceSubmitOrphanPreambles.Desc": "対象キューが受け取らない場合でも GPU コマンドバッファのプリアンブルを配信します。\n通常はオフのままにしてください。決してシグナルされない GPU フェンスを待ってハングするタイトルで有効にします。",
   "Common.Save": "保存",
   "Common.Cancel": "キャンセル",
   "Options.About": "情報",