Fix numpy binary incompatibility on Python 3.10

Add explicit numpy>=2.0.0 constraint to dct, web, and api extras.
Scipy/jpegio wheels are built against numpy 2.x, so we need to ensure
numpy 2.x is installed to avoid dtype size mismatch errors.

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

pyproject.toml

@@ -45,6 +45,7 @@ dependencies = [
 [project.optional-dependencies]
 # DCT steganography support (v3.0+)
 dct = [
+    "numpy>=2.0.0",
     "scipy>=1.10.0",
     "jpegio>=0.2.0",
 ]
@@ -61,6 +62,7 @@ web = [
     "qrcode>=7.3.0",
     "pyzbar>=0.1.9",
     # Include DCT support for web UI
+    "numpy>=2.0.0",
     "scipy>=1.10.0",
     "jpegio>=0.2.0",
 ]
@@ -71,6 +73,7 @@ api = [
     "qrcode>=7.30",
     "pyzbar>=0.1.9",
     # Include DCT support for API
+    "numpy>=2.0.0",
     "scipy>=1.10.0",
     "jpegio>=0.2.0",
 ]