Add pre-commit hooks for code quality (#19)

## Summary
- Add pre-commit framework with hooks for YAML, Ansible, Python, shell, TOML, JSON, and secret detection
- Fix all 91+ ansible-lint violations (variable naming, handler capitalization, changed_when)
- Fix shellcheck warnings in mise-tasks scripts
- Document pre-commit setup in README.md

## Deployment and Testing
- [x] All pre-commit hooks pass (`uvx pre-commit run --all-files`)
- [x] Test ansible playbook with `--check` mode
- [x] Run `mise run indri-services-check` after deploy

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

Reviewed-on: https://forge.tail8d86e.ts.net/eblume/blumeops/pulls/19

ansible/roles/transmission_metrics/templates/transmission-metrics.sh.j2

@@ -4,7 +4,7 @@
 
 set -euo pipefail
 
-RPC_URL="http://{{ transmission_rpc_host }}:{{ transmission_rpc_port }}/transmission/rpc"
+RPC_URL="http://{{ transmission_metrics_rpc_host }}:{{ transmission_metrics_rpc_port }}/transmission/rpc"
 OUTPUT_FILE="{{ transmission_metrics_dir }}/transmission.prom"
 TEMP_FILE="${OUTPUT_FILE}.tmp"