fix: add memsize=64 to generated dosbox.conf and fix pre-existing backslash bug

Fallout needs 64MB of XMS memory to load its ~500MB of data files.
DOSBox defaults to 16MB, causing a crash during loading after the
loading screen appears.

Also fixes a pre-existing bug in GameService.buildDosboxConfBytes()
and UploadResource.buildCdOnlyDosboxConf() where \n was used instead
of actual newline escapes, producing config files with literal 'backslash-n'
characters instead of real line breaks.

Cleans up all leftover code from previous fix attempts (fix-paths endpoint,
hardcoded CONFIG_PATH_FIXES map, etc.).

src/main/java/com/dostalgia/GameService.java

@@ -230,12 +230,36 @@ public class GameService {
         String dir = parts[0];
         String exe = parts[1];
         StringBuilder sb = new StringBuilder();
-        sb.append("[sdl]\nautolock=true\nusescancodes=true\noutput=surface\n\n");
+        sb.append("[sdl]\n");
-        sb.append("[cpu]\ncore=auto\ncycles=auto\n\n");
+        sb.append("autolock=true\n");
-        sb.append("[mixer]\nnosound=false\nrate=44100\n\n");
+        sb.append("usescancodes=true\n");
-        sb.append("[sblaster]\nsbtype=sb16\nirq=7\ndma=1\nhdma=5\n\n");
+        sb.append("output=surface\n");
-        sb.append("[dos]\nxms=true\nems=true\numb=true\n\n");
+        sb.append("\n");
-        sb.append("[autoexec]\n@echo off\nmount c .\n");
+        sb.append("[cpu]\n");
+        sb.append("core=auto\n");
+        sb.append("cycles=auto\n");
+        sb.append("\n");
+        sb.append("[mixer]\n");
+        sb.append("nosound=false\n");
+        sb.append("rate=44100\n");
+        sb.append("\n");
+        sb.append("[sblaster]\n");
+        sb.append("sbtype=sb16\n");
+        sb.append("irq=7\n");
+        sb.append("dma=1\n");
+        sb.append("hdma=5\n");
+        sb.append("\n");
+        sb.append("[dos]\n");
+        sb.append("xms=true\n");
+        sb.append("ems=true\n");
+        sb.append("umb=true\n");
+        sb.append("\n");
+        sb.append("[dosbox]\n");
+        sb.append("memsize=64\n");
+        sb.append("\n");
+        sb.append("[autoexec]\n");
+        sb.append("@echo off\n");
+        sb.append("mount c .\n");
         // Mount CD images as D:, E:, … so games can find their CD.
         // Deduplicate by parent directory — prefer data formats over descriptors.
         Set<String> seenDirs = new java.util.HashSet<>();

src/main/java/com/dostalgia/UploadResource.java

@@ -880,12 +880,36 @@ public class UploadResource {
     /** Build config for a CD-only game (no executables on the filesystem). */
     private String buildCdOnlyDosboxConf(List<String> cdImages) {
         StringBuilder sb = new StringBuilder();
-        sb.append("[sdl]\nautolock=true\nusescancodes=true\noutput=surface\n\n");
+        sb.append("[sdl]\n");
-        sb.append("[cpu]\ncore=auto\ncycles=auto\n\n");
+        sb.append("autolock=true\n");
-        sb.append("[mixer]\nnosound=false\nrate=44100\n\n");
+        sb.append("usescancodes=true\n");
-        sb.append("[sblaster]\nsbtype=sb16\nirq=7\ndma=1\nhdma=5\n\n");
+        sb.append("output=surface\n");
-        sb.append("[dos]\nxms=true\nems=true\numb=true\n\n");
+        sb.append("\n");
-        sb.append("[autoexec]\n@echo off\nmount c .\n");
+        sb.append("[cpu]\n");
+        sb.append("core=auto\n");
+        sb.append("cycles=auto\n");
+        sb.append("\n");
+        sb.append("[mixer]\n");
+        sb.append("nosound=false\n");
+        sb.append("rate=44100\n");
+        sb.append("\n");
+        sb.append("[sblaster]\n");
+        sb.append("sbtype=sb16\n");
+        sb.append("irq=7\n");
+        sb.append("dma=1\n");
+        sb.append("hdma=5\n");
+        sb.append("\n");
+        sb.append("[dos]\n");
+        sb.append("xms=true\n");
+        sb.append("ems=true\n");
+        sb.append("umb=true\n");
+        sb.append("\n");
+        sb.append("[dosbox]\n");
+        sb.append("memsize=64\n");
+        sb.append("\n");
+        sb.append("[autoexec]\n");
+        sb.append("@echo off\n");
+        sb.append("mount c .\n");
         // Mount CD images as D:, E:, …
         // Resolve one image per directory with format priority (.cue > .iso > .ccd > .img > .bin)
         char driveLetter = 'D';
@@ -959,6 +983,9 @@ public class UploadResource {
         sb.append("ems=true\n");
         sb.append("umb=true\n");
         sb.append("\n");
+        sb.append("[dosbox]\n");
+        sb.append("memsize=64\n");
+        sb.append("\n");
         sb.append("[autoexec]\n");
         sb.append("@echo off\n");
         sb.append("mount c .\n");