feat: add email-server-worker with clean template architecture

Add new email-server-worker project implementing a self-scheduling background worker pattern with HTTP monitoring. Removed all business-specific code from copied source, creating a clean, reusable template.

Key features:
- Self-scheduling worker loop with configurable interval
- Graceful shutdown support (Docker-compatible)
- Prometheus metrics collection
- Health check endpoints (/healthcheck, /metrics, /ping)
- Example worker template for easy customization
- Comprehensive architecture documentation in CLAUDE.md

The worker is now ready for email server implementation with no external dependencies on Evolution/MSSQL/ElasticSearch.

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

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

email-server-worker/tsconfig.json

@@ -0,0 +1,36 @@
+{
+  "compilerOptions": {
+    "target": "es2020", // https://github.com/microsoft/TypeScript/wiki/Node-Target-Mapping
+    "module": "commonjs",
+    "esModuleInterop": true, // solves the problem regarding the default importa vs importa *
+    "strict": true,
+    "sourceMap": true, // please do create source maps
+    "skipLibCheck": true, // don't verify typescript of 3rd party modules
+    "rootDir": "src", // root directory under which source files are located - it's subtree will be mirrored in "outDir"
+    "outDir": "build", // where the build files should be stored
+// "baseUrl" ---- se NE SMIJE koristiti
+// POJAŠNJENJE: ako zadamo "baseUrl" Intellisense će početi kod autocompletion-a (Ctrl+Space)
+//              umjesto relativnih insertirati apsolutni path do modula,
+//              a takav path nije dobar za build niti debugging
+//      "baseUrl": "./", // set a base directory to resolve non-absolute module names - This must be specified if "paths" is used
+    "paths": {
+    },
+    "plugins": [
+      {
+        // Slijedeće je namijenjeno BUILD projekta
+        // POJAŠNJENJE: build tadi `ttypescript`
+        //              koji ne zna interpretirati što je podešeno pod "path"
+        //              > to za njega rješava "typescript-transform-paths"
+        "transform": "typescript-transform-paths"
+      }
+    ]
+  },
+  "include": ["src/**/*"], // location of files which need to be compiled
+  // Slijedeće je namijenjeno DEBUGGING servera u VS Code-u
+  // POJAŠNJENJE: kod debugginga modul se pokreće pomoću `ts-node`,
+  //              koji ne zna sam interpretirati što je podešeno pod "paths"
+  //              > to za njega rješava "tsconfig-paths/register"
+  "ts-node": {
+    "require": ["tsconfig-paths/register"]
+  },
+}