Phase 2: Performance Profiling Setup - Add profiling utilities

- Add StartupProfiler: Measure cold/warm start times
- Add VideoProfiler: Profile video load, playback metrics
- Add MemoryProfiler: Detect memory leaks, monitor heap growth
- Add HiveEncryptionBenchmark: Measure encryption overhead
- Add PHASE_2_PROFILING_PLAN.md: Complete testing procedures

Ready for profiling execution once Flutter SDK is initialized

_bmad/bmm/4-implementation/bmad-qa-generate-e2e-tests/SKILL.md

@@ -0,0 +1,6 @@
+---
+name: bmad-qa-generate-e2e-tests
+description: 'Generate end to end automated tests for existing features. Use when the user says "create qa automated tests for [feature]"'
+---
+
+Follow the instructions in ./workflow.md.