refactor: move blob-related files to web/blob/

Move blob.cpp, DOMFormData, JSDOMFile, and JSDOMFormData
from bindings/ and webcore/ to web/blob/.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

cmake/Sources.json

@@ -79,6 +79,7 @@
       "src/buntime/core/*.cpp",
       "src/buntime/web/fetch/*.cpp",
       "src/buntime/web/url/*.cpp",
+      "src/buntime/web/blob/*.cpp",
       "src/bake/*.cpp",
       "src/deps/*.cpp",
       "src/vm/*.cpp",

cmake/targets/BuildBun.cmake

@@ -891,6 +891,7 @@ target_include_directories(${bun} PRIVATE
   ${CWD}/src/buntime/core
   ${CWD}/src/buntime/web/fetch
   ${CWD}/src/buntime/web/url
+  ${CWD}/src/buntime/web/blob
   ${CWD}/src/buntime/modules
   ${CWD}/src/js/builtins
   ${CWD}/src/napi

src/buntime/jsc.zig

@@ -49,7 +49,7 @@ pub const CallFrame = @import("./bindings/CallFrame.zig").CallFrame;
 pub const CommonAbortReason = @import("./bindings/CommonAbortReason.zig").CommonAbortReason;
 pub const CommonStrings = @import("./bindings/CommonStrings.zig").CommonStrings;
 pub const CustomGetterSetter = @import("./bindings/CustomGetterSetter.zig").CustomGetterSetter;
-pub const DOMFormData = @import("./bindings/DOMFormData.zig").DOMFormData;
+pub const DOMFormData = @import("./web/blob/DOMFormData.zig").DOMFormData;
 pub const DOMURL = @import("./web/url/DOMURL.zig").DOMURL;
 pub const DecodedJSValue = @import("./bindings/DecodedJSValue.zig").DecodedJSValue;
 pub const DeferredError = @import("./api/error/DeferredError.zig").DeferredError;