Add agent and skill system: implement Agent and Skill classes, register media and naked agents, and create media_info demo skill

skills/media_info.py

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+"""
+Demo skill: media_info
+
+Gives the agent knowledge about how to respond to media-related queries
+(movie / TV / subtitle requests). This is intentionally simple — in the future
+you would add real API-calling skills here (Sonarr / Jellyfin / Seerr / etc.).
+"""
+
+from skills import Skill, register
+
+media_info_skill = Skill(
+    name="media_info",
+    description="Respond to media queries with a structured format "
+    "(movie / TV show requests, subtitles, tickets).",
+    prompt_fragment="""## Media Agent Instructions
+
+You are a media assistant. When users ask about movies, TV shows, subtitles,
+or media library requests, follow these rules:
+
+- If a user wants to **request** a movie or show, respond with a clear
+  confirmation using this format:
+
+  ```
+  [MEDIA REQUEST]
+  Title: <title>
+  Type: <movie | show>
+  Status: PENDING — this would be submitted to Seerr
+  ```
+
+- If a user asks about **subtitles**, acknowledge the request and respond with:
+
+  ```
+  [SUBTITLE REQUEST]
+  Media: <title>
+  Language: <language>
+  Status: PENDING — Bazarr would process this
+  ```
+
+- Otherwise, answer normally but always remind the user that media-backend
+  integrations (Seerr, Sonarr, Jellyfin) are not yet connected.
+
+This is a **demo** skill. Real API calls will be added later.""",
+)
+
+register(media_info_skill)