Implement ViewIt Plugin System Documentation and Update Project Notes

- Added comprehensive documentation for the ViewIt Plugin System, detailing the plugin loading process, required methods, optional features, and community extension workflow.
- Updated project notes to reflect the current structure, build process, search logic, and known issues.
- Introduced new build scripts for installing the add-on and creating ZIP packages.
- Added test scripts for TMDB API integration, including argument parsing and logging functionality.
- Enhanced existing plugins with improved search logic and error handling.

addon/resolveurl_backend.py

@@ -0,0 +1,43 @@
+"""Optionales ResolveURL-Backend für das Kodi-Addon.
+
+Wenn `script.module.resolveurl` installiert ist, kann damit eine Hoster-URL
+zu einer abspielbaren Media-URL (inkl. evtl. Header-Suffix) aufgelöst werden.
+"""
+
+from __future__ import annotations
+
+from typing import Optional
+
+
+def resolve(url: str) -> Optional[str]:
+    if not url:
+        return None
+    try:
+        import resolveurl  # type: ignore
+    except Exception:
+        return None
+
+    try:
+        hosted = getattr(resolveurl, "HostedMediaFile", None)
+        if callable(hosted):
+            hmf = hosted(url)
+            valid = getattr(hmf, "valid_url", None)
+            if callable(valid) and not valid():
+                return None
+            resolver = getattr(hmf, "resolve", None)
+            if callable(resolver):
+                result = resolver()
+                return str(result) if result else None
+    except Exception:
+        pass
+
+    try:
+        resolve_fn = getattr(resolveurl, "resolve", None)
+        if callable(resolve_fn):
+            result = resolve_fn(url)
+            return str(result) if result else None
+    except Exception:
+        return None
+
+    return None
+