chore: release v0.2.0

Production-readiness pass: security hardening, performance improvements,
new services (send_message, set_repeat, refresh_library), diagnostics,
reauth flow, image proxy, per-instance device IDs, exponential WS
reconnect backoff, ID validation, stale device cleanup, and supporting
integration plumbing. Three rounds of independent code review applied.

See RELEASE_NOTES.md for the full changelog.

custom_components/emby_player/services.yaml

@@ -0,0 +1,63 @@
+send_message:
+  name: Send Message
+  description: >-
+    Display a message on the Emby client device.
+  target:
+    entity:
+      integration: emby_player
+      domain: media_player
+  fields:
+    message:
+      name: Message
+      description: The text to display on the client.
+      required: true
+      example: "Pizza is here!"
+      selector:
+        text:
+    header:
+      name: Header
+      description: Optional header/title for the message.
+      example: "Doorbell"
+      selector:
+        text:
+    timeout_ms:
+      name: Timeout (ms)
+      description: How long to display the message, in milliseconds.
+      example: 5000
+      default: 5000
+      selector:
+        number:
+          min: 100
+          max: 60000
+          step: 100
+          mode: box
+          unit_of_measurement: ms
+
+set_repeat:
+  name: Set Repeat Mode
+  description: Set the repeat mode of the current playback.
+  target:
+    entity:
+      integration: emby_player
+      domain: media_player
+  fields:
+    repeat_mode:
+      name: Repeat Mode
+      description: One of RepeatNone, RepeatOne, RepeatAll.
+      required: true
+      selector:
+        select:
+          options:
+            - RepeatNone
+            - RepeatOne
+            - RepeatAll
+
+refresh_library:
+  name: Refresh Library
+  description: >-
+    Trigger an Emby server library scan. If no entity is provided, all
+    configured Emby servers are refreshed.
+  target:
+    entity:
+      integration: emby_player
+      domain: media_player