docs(workflow): formalize gitflow process and templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Report a defect affecting behavior or reliability
+title: "[Bug] "
+labels: bug
+assignees: ""
+---
+
+## Description
+
+What is wrong?
+
+## Steps to Reproduce
+
+1.
+2.
+3.
+
+## Expected Behavior
+
+What should happen?
+
+## Actual Behavior
+
+What happens instead?
+
+## Environment
+
+- Branch:
+- Commit:
+- Docker command used:
+
+## Logs / Screenshots
+
+Add relevant logs or screenshots.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Contribution Guidelines
+    url: ./CONTRIBUTING.md
+    about: Read branch rules and PR checklist before opening work items.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Propose a new capability aligned with product milestones
+title: "[Feature] "
+labels: enhancement
+assignees: ""
+---
+
+## Problem
+
+What user or business problem are we solving?
+
+## Proposed Solution
+
+Describe the minimum viable implementation.
+
+## Scope
+
+- In scope:
+- Out of scope:
+
+## Acceptance Criteria
+
+- [ ]
+- [ ]
+
+## GitFlow Plan
+
+- Branch suggestion: `feature/<scope>-<short-description>`
+- Target milestone:

.github/PULL_REQUEST_TEMPLATE.md

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+## Summary
+
+Describe what changed and why.
+
+## Branch and Target
+
+- Source branch: `feature/*` / `release/*` / `hotfix/*`
+- Target branch: `develop` / `main`
+
+## Checklist
+
+- [ ] Scope is focused and avoids unrelated refactors
+- [ ] Docker stack runs (`docker compose up -d`)
+- [ ] Tests are passing
+- [ ] Migrations included (if needed)
+- [ ] Docs updated (if needed)
+- [ ] Changelog updated under `Unreleased`
+- [ ] No secrets committed
+
+## Testing
+
+List commands and key outputs.
+
+## Risk and Rollback
+
+Briefly note deployment risk and rollback approach.