feat: Add Mbox ingestion

This commit introduces two major features:

1.  **Mbox File Ingestion:**
    Users can now ingest emails from Mbox files (`.mbox`). A new Mbox connector has been implemented on the backend, and the user interface has been updated to support creating Mbox ingestion sources. Documentation for this new provider has also been added.

Additionally, this commit includes new documentation for upgrading and migrating Open Archiver.

.github/ISSUE_TEMPLATE/bug_report.md

@@ -1,32 +0,0 @@
----
-name: Bug report
-about: Create a report to help us improve
-title: ''
-labels: bug
-assignees: ''
-
----
-
-**Describe the bug**
-A clear and concise description of what the bug is.
-
-**To Reproduce**
-Steps to reproduce the behavior:
-1. Go to '...'
-2. Click on '....'
-5. See error
-
-**Expected behavior**
-A clear and concise description of what you expected to happen.
-
-**Screenshots**
-If applicable, add screenshots to help explain your problem.
-
-**System:**
- - Open Archiver Version: 
-
-**Relevant logs:**
-Any relevant logs (Redact sensitive information)
-
-**Additional context**
-Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

@@ -1,20 +0,0 @@
----
-name: Feature request
-about: Suggest an idea for this project
-title: ''
-labels: enhancement
-assignees: ''
-
----
-
-**Is your feature request related to a problem? Please describe.**
-A clear and concise description of what the problem is. 
-
-**Describe the solution you'd like**
-A clear and concise description of what you want to happen.
-
-**Describe alternatives you've considered**
-A clear and concise description of any alternative solutions or features you've considered.
-
-**Additional context**
-Add any other context or screenshots about the feature request here.

packages/backend/package.json

@@ -59,7 +59,7 @@
 		"reflect-metadata": "^0.2.2",
 		"sqlite3": "^5.1.7",
 		"tsconfig-paths": "^4.2.0",
-		"xlsx": "https://cdn.sheetjs.com/xlsx-0.20.3/xlsx-0.20.3.tgz",
+		"xlsx": "^0.18.5",
 		"yauzl": "^3.2.0",
 		"zod": "^4.1.5"
 	},
@@ -74,6 +74,7 @@
 		"@types/multer": "^2.0.0",
 		"@types/node": "^24.0.12",
 		"@types/yauzl": "^2.10.3",
+		"bull-board": "^2.1.3",
 		"ts-node-dev": "^2.0.0",
 		"typescript": "^5.8.3"
 	}

packages/frontend/package.json

@@ -15,7 +15,7 @@
 	"dependencies": {
 		"@iconify/svelte": "^5.0.1",
 		"@open-archiver/types": "workspace:*",
-		"@sveltejs/kit": "^2.38.1",
+		"@sveltejs/kit": "^2.16.0",
 		"bits-ui": "^2.8.10",
 		"clsx": "^2.1.1",
 		"d3-shape": "^3.2.0",