Improve project create command

[welias]

What changed

• add projects types to list valid project type IDs from the API
• extend projects create to accept --assign and --estimated-hours
• validate that at least one asset is provided before creating a project
• improve project creation error messages for invalid project type and missing assets
• update the CLI version to 0.3.10
• document the new project creation flow in the README

Why

Creating projects required users to guess valid typeId values and provided poor feedback when the API rejected required fields. It also did not allow setting assignees or estimated hours during creation.

Impact

Users can now discover valid project types directly from the CLI and create projects with assignees, estimated hours, and clearer validation guidance.

Validation

• PYTHONPATH=src .venv/bin/python -m py_compile src/conviso/commands/projects.py src/conviso/schemas/project_types_schema.py
• PYTHONPATH=src .venv/bin/python -m conviso.app projects create --help
• PYTHONPATH=src .venv/bin/python -m conviso.app projects types --limit 3
• manual API validation by creating a project successfully after supplying a valid --type-id and --assets