feat(error-tracking): add GlitchTip integration with shared error-tracking package

Infrastructure:
- Add GlitchTip (web + worker) to docker-compose.macmini.yml (port 8020)
- Add glitchtip.mana.how to Cloudflare Tunnel config
- Add glitchtip database to init-db SQL
- Add GLITCHTIP_DSN to .env.development

Shared Package (@manacore/shared-error-tracking):
- initErrorTracking() - Sentry-compatible init with GlitchTip DSN
- captureException(), captureMessage(), setUser(), setTag(), flush()
- SentryExceptionFilter for NestJS (captures 5xx errors only)
- Graceful no-op when DSN is not configured

Integration:
- Add instrument.ts to calendar, contacts, todo backends
- Import instrument.ts before app bootstrap in all 3 main.ts files
- Error tracking auto-initializes when GLITCHTIP_DSN env var is set

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/shared-error-tracking/package.json

@@ -0,0 +1,45 @@
+{
+	"name": "@manacore/shared-error-tracking",
+	"version": "1.0.0",
+	"description": "Error tracking integration for ManaCore apps (GlitchTip/Sentry-compatible)",
+	"main": "dist/index.js",
+	"types": "dist/index.d.ts",
+	"exports": {
+		".": {
+			"types": "./dist/index.d.ts",
+			"default": "./dist/index.js"
+		},
+		"./nestjs": {
+			"types": "./dist/nestjs.d.ts",
+			"default": "./dist/nestjs.js"
+		}
+	},
+	"files": [
+		"dist"
+	],
+	"scripts": {
+		"build": "tsc",
+		"type-check": "tsc --noEmit"
+	},
+	"dependencies": {
+		"@sentry/node": "^9.0.0"
+	},
+	"peerDependencies": {
+		"@nestjs/common": "^10.0.0 || ^11.0.0",
+		"@nestjs/core": "^10.0.0 || ^11.0.0"
+	},
+	"peerDependenciesMeta": {
+		"@nestjs/common": {
+			"optional": true
+		},
+		"@nestjs/core": {
+			"optional": true
+		}
+	},
+	"devDependencies": {
+		"@nestjs/common": "^10.0.0",
+		"@nestjs/core": "^10.0.0",
+		"@types/node": "^22.10.2",
+		"typescript": "^5.0.0"
+	}
+}