refactor: rename project videnc-vibe -> av1dae

Rename the Go module, the cmd/ entrypoint dir, the binary, the default config
dir (~/.config/av1dae/), the Docker image/compose service, and all docs and
the dashboard wordmark. No behavioral change — import paths and identifiers
only.

SPEC.md

@@ -1,11 +1,11 @@
-# videnc-vibe Specification
+# av1dae Specification
 
 ## Overview
 FFmpeg-based video transcoder for DVD/Blu-ray to SVT-AV1 with automatic metadata fetching.
 
 ## Configuration
 
-Config path: `-c` flag or `~/.config/videnc-vibe/config.yaml`
+Config path: `-c` flag or `~/.config/av1dae/config.yaml`
 
 ```yaml
 omdb_api_key: "your-key-here"
@@ -27,7 +27,7 @@ paths:
 
 ## Flags
 - `-d` : Delete original after successful encode (default: move to originals/)
-- `-c` : Config file path (default: ~/.config/videnc-vibe/config.yaml)
+- `-c` : Config file path (default: ~/.config/av1dae/config.yaml)
 
 ## Input Parsing