[HLE] Stub ContentExport, Font, and Pad calls Astro Bot needs to boot (#298)

Astro Bot asserts and null-writes when a subsystem init call fails, so
each missing import surfaces as a named crash. This stubs the blockers
observed during bring-up: content export init, eight font calls, and
pad tilt correction. sceFontGetHorizontalLayout writes the same
invented geometry as sceFontGetRenderCharGlyphMetrics and the rest
report success. Together with save data memory2 these take the title
to its splash image and font glyph rendering path.

src/SharpEmu.Libs/ContentExport/ContentExportExports.cs

@@ -0,0 +1,18 @@
+// Copyright (C) 2026 SharpEmu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+using SharpEmu.HLE;
+
+namespace SharpEmu.Libs.ContentExport;
+
+// No host media library exists to export captures into, so initialization
+// reports success.
+public static class ContentExportExports
+{
+    [SysAbiExport(
+        Nid = "0GnN4QCgIfs",
+        ExportName = "sceContentExportInit2",
+        Target = Generation.Gen5,
+        LibraryName = "libSceContentExport")]
+    public static int ContentExportInit2(CpuContext ctx) => ctx.SetReturn(0);
+}