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.

dist/plugin.video.viewit/http_session_pool.py

@@ -0,0 +1,34 @@
+#!/usr/bin/env python3
+"""Shared requests.Session pooling for plugins.
+
+Goal: reuse TCP connections/cookies across multiple HTTP calls within a Kodi session.
+"""
+
+from __future__ import annotations
+
+from typing import Any, Dict, Optional
+
+try:  # pragma: no cover - optional dependency
+    import requests
+except Exception:  # pragma: no cover
+    requests = None
+
+_SESSIONS: Dict[str, Any] = {}
+
+
+def get_requests_session(key: str, *, headers: Optional[dict[str, str]] = None):
+    """Return a cached `requests.Session()` for the given key."""
+    if requests is None:
+        raise RuntimeError("requests ist nicht verfuegbar.")
+    key = (key or "").strip() or "default"
+    session = _SESSIONS.get(key)
+    if session is None:
+        session = requests.Session()
+        _SESSIONS[key] = session
+    if headers:
+        try:
+            session.headers.update({str(k): str(v) for k, v in headers.items() if k and v})
+        except Exception:
+            pass
+    return session
+