feat(config): add issue templates for Epics, User Stories, and Subtasks

.gitea/ISSUE_TEMPLATE/epic.md

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+---
+name: "Epic"
+about: "A large initiative or feature that consists of multiple User Stories or Subtasks"
+title: "[Epic] <Epic title>"
+labels: ["Type/Epic"]
+---
+
+## 🧩 Epic Summary
+Provide a clear summary of what this Epic aims to achieve.
+
+---
+
+## 🎯 Goals
+- [ ] Goal 1
+- [ ] Goal 2
+- [ ] Goal 3
+
+---
+
+## 📋 Description
+Describe the high-level context, purpose, and expected outcome of this Epic.
+
+---
+
+## 🧵 Related User Stories / Subtasks
+Link to related issues here:
+- [ ] #<user-story-1>
+- [ ] #<user-story-2>
+- [ ] #<subtask-1>
+
+---
+
+## 📅 Milestone / Timeline
+If applicable, note any key dates or milestones:
+- Target Start:
+- Target Completion:
+
+---
+
+## ⚠️ Risks / Dependencies
+List any major risks or dependencies that could affect delivery.
+
+---
+
+## ✅ Acceptance Criteria
+Define the success metrics or completion definition for the Epic.

.gitea/ISSUE_TEMPLATE/subtask.md

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+---
+name: "Subtask"
+about: "A smaller task that contributes to a User Story or Epic"
+title: "[Subtask] <Task title>"
+labels: ["Type/Subtask"]
+---
+
+## 🧾 Description
+Briefly describe what needs to be done for this subtask.
+
+---
+
+## 🔗 Linked Issues
+- Parent Story: #<user-story-number>
+- Related Epic: #<epic-number>
+
+---
+
+## ⚙️ Steps / Tasks
+- [ ] Task 1
+- [ ] Task 2
+- [ ] Task 3
+
+---
+
+## ✅ Definition of Done
+What must be true for this subtask to be considered complete:
+- [ ] Code implemented
+- [ ] Tests passed
+- [ ] Reviewed and merged
+
+---
+
+## 🧩 Estimated Size
+Use label: `Size/XS` | `Size/S` | `Size/M` | `Size/L` | `Size/XL`

.gitea/ISSUE_TEMPLATE/user_story.md

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+---
+name: "User Story"
+about: "A feature or requirement from the user's perspective"
+title: "[Story] <User story title>"
+labels: ["Type/User Story"]
+---
+
+## 🧍‍♂️ User Story
+**As a** [type of user]  
+**I want to** [perform an action]  
+**So that** [achieve a goal or value]
+
+---
+
+## 📋 Description
+Provide additional context or business logic for this story.
+
+---
+
+## 🎯 Acceptance Criteria
+List the specific, measurable criteria that define when this story is done:
+- [ ] Criterion 1
+- [ ] Criterion 2
+- [ ] Criterion 3
+
+---
+
+## 🧱 Implementation Notes
+Include technical notes, design references, or constraints.
+
+---
+
+## 🧵 Linked Issues
+- Parent Epic: #<epic-number>
+- Related Subtasks:
+  - [ ] #<subtask-1>
+  - [ ] #<subtask-2>
+
+---
+
+## 🧩 Estimated Size
+Use label: `Size/XS` | `Size/S` | `Size/M` | `Size/L` | `Size/XL`