Add SnapForm panels, preferences, properties, and runtime management

- Implemented RuntimeModelsPanel and DebugPanel for UI integration in Blender.
- Created SnapFormPreferences to manage user settings for storage and runtime configuration.
- Defined SnapFormSettings to hold various properties related to input, model selection, and export options.
- Developed runtime management functions for installation, model downloading, and reconstruction commands.
- Added status bar functionality to display job progress and status in the Blender UI.
- Implemented worker script for handling model downloads and depth reconstruction tasks.
- Introduced unit tests for download progress reporting and image depth extraction functionalities.

src/snapform/blender_manifest.toml

@@ -0,0 +1,23 @@
+schema_version = "1.0.0"
+
+id = "snapform"
+version = "0.9.27"
+name = "SnapForm"
+tagline = "Build spatial structures from images, fast"
+maintainer = "OmooLab"
+type = "add-on"
+
+blender_version_min = "4.5.0"
+platforms = ["windows-x64"]
+license = ["SPDX:GPL-3.0-or-later"]
+
+[permissions]
+network = "Download DA3 runtime dependencies and model weights"
+files = "Read source images and store runtime data"
+
+[build]
+paths_exclude_pattern = [
+  "__pycache__/",
+  ".*",
+  "*.zip",
+]