fix(organize): exclude Civitai meta tags from folder names (#1119)

Follow-up to the keyword-dump guard. The reported model's tag list is
["lora, character, ... face", "base model"], so skipping the dump left the
"base model" label to be picked as the folder name. That label describes
Civitai's listing rather than the model's content, which makes it as
meaningless as a folder as the blob was.

Add CIVITAI_META_TAGS and is_civitai_meta_tag(), and skip those labels in
the automatic fallback. An explicit priority entry still matches them, so a
user who does want a "base model" folder can configure one.

The reported model now resolves to "Krea 2/no tags" instead of
"Krea 2/base model".

Also correct a comment that listed ".civitai.info" among the files sitting
next to a model. LoRA Manager only reads that sidecar -- other tools write
it -- and writes ".metadata.json" itself.

docs/priority_tags_help.md

@@ -32,6 +32,7 @@ When your path template contains `{first_tag}`, the app picks a folder name base
 - It checks the priority list from top to bottom. If a canonical tag or any of its aliases appear in the model tags, that canonical name becomes the folder name.
 - If no priority tags are found but the model has tags, the first tag that can be used as a folder name is chosen.
 - Tags that contain a comma, or that are longer than 50 characters, are treated as unusable and skipped: some uploaders pack their whole keyword list into a single tag. If every tag is unusable, the folder falls back to `no tags`.
+- Civitai's structural labels, such as `base model`, describe the listing rather than the model, so the automatic fallback skips them too. Add one to your priority list if you really want it as a folder name.
 - If the model has no tags at all, the folder falls back to `no tags`.
 
 ### Example
@@ -44,6 +45,7 @@ With a template like `/{model_type}/{first_tag}` and the priority entry list `ch
 | `["anime", "portrait"]` | `style` | `anime` hits the `style` entry, so its canonical label is used. |
 | `["portrait", "bw"]` | `portrait` | No priority match, so the first model tag is used. |
 | `["lora, character, rosie, ... face"]` | `no tags` | The only tag is a keyword dump, so it is skipped. |
+| `["lora, character, ... face", "base model"]` | `no tags` | A keyword dump plus a Civitai label: nothing usable is left. |
 | `[]` | `no tags` | Nothing to match, so the fallback is applied. |
 
 ## 3. Save the Settings