feat: Add test runner script and Gitea Actions CI

How to run tests (answers user question):

Manual execution:
  ./run_tests.sh                    # Quick way with auto-configured python
  python -m pytest tests/unit/ -v   # Direct pytest command

Automated (Gitea Actions):
  - Tests run on every push/PR to main branch
  - Workflow file: .gitea/workflows/test.yml
  - Status visible at repo actions page

CI skips PySide6-dependent GUI tests by default.

run_tests.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+# Run pytest tests with proper Python path
+
+cd "$(dirname "$0")"
+
+# Use full python path if in Hermes environment
+if [ -f "/opt/hermes/tools/python-3.14.9+202****1021-linux-x64/bin/python" ]; then
+    PYTHON="/opt/hermes/tools/python-3.14.9+202****1021-linux-x64/bin/python"
+else
+    PYTHON="python3"
+fi
+
+echo "Running tests with: $PYTHON"
+
+# Run all tests except GUI-dependent ones (requires PySide6)
+$PYTHON -m pytest tests/unit/ \
+  --ignore=tests/unit/test_updater.py \
+  --ignore=tests/unit/test_plugin_manager.py \
+  --ignore=tests/unit/test_flares.py \
+  "$@"