feat: add PR templates per content type (#7)

Co-authored-by: Paperclip <noreply@paperclip.ing>

Author: tallnato

.github/PULL_REQUEST_TEMPLATE/boombox.md

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+## Boombox Track Submission
+
+**Content type:** Boombox
+
+### Checklist
+
+#### Required files
+- [ ] `meta.yaml` with all required fields
+- [ ] Audio file: `.mp3`, `.wav`, or `.ogg`
+
+#### meta.yaml fields
+- [ ] `title` — display name for this boombox track
+- [ ] `author` — creator name or handle
+- [ ] `description` — brief description of the track
+- [ ] `tags` — array of tags from `content/tags.yaml` (optional)
+
+#### Naming & structure
+- [ ] Folder placed in `content/boombox/<slug>/`
+- [ ] Slug is lowercase alphanumeric with hyphens (e.g. `chill-vibes`)
+- [ ] No file exceeds 50 MB
+
+### Description
+
+<!-- Describe your boombox track: genre, mood, etc. -->

.github/PULL_REQUEST_TEMPLATE/hornsound.md

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+## Horn Sound Submission
+
+**Content type:** Horn Sound
+
+### Checklist
+
+#### Required files
+- [ ] `meta.yaml` with all required fields
+- [ ] Audio file: `.mp3`, `.wav`, or `.ogg`
+
+#### meta.yaml fields
+- [ ] `title` — display name for this horn sound
+- [ ] `author` — creator name or handle
+- [ ] `description` — brief description of the horn sound
+- [ ] `tags` — array of tags from `content/tags.yaml` (optional)
+
+#### Naming & structure
+- [ ] Folder placed in `content/hornsounds/<slug>/`
+- [ ] Slug is lowercase alphanumeric with hyphens (e.g. `la-cucaracha`)
+- [ ] No file exceeds 50 MB
+
+### Description
+
+<!-- Describe your horn sound: what it sounds like, inspiration, etc. -->

.github/PULL_REQUEST_TEMPLATE/lightshow.md

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+## Light Show Submission
+
+**Content type:** Light Show
+
+### Checklist
+
+#### Required files
+- [ ] `meta.yaml` with all required fields
+- [ ] `.fseq` sequence file
+- [ ] `.mp3` audio file (optional but recommended)
+
+#### meta.yaml fields
+- [ ] `title` — display name for this light show
+- [ ] `author` — creator name or handle
+- [ ] `description` — brief description of the light show
+- [ ] `tags` — array of tags from `content/tags.yaml` (optional)
+
+#### Naming & structure
+- [ ] Folder placed in `content/lightshows/<slug>/`
+- [ ] Slug is lowercase alphanumeric with hyphens (e.g. `holiday-special`)
+- [ ] No file exceeds 50 MB
+
+### Description
+
+<!-- Describe your light show: what song/theme, any special effects, etc. -->
+
+### Preview
+
+<!-- Link to a video preview if available -->

.github/PULL_REQUEST_TEMPLATE/locksound.md

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+## Lock Sound Submission
+
+**Content type:** Lock Sound
+
+### Checklist
+
+#### Required files
+- [ ] `meta.yaml` with all required fields
+- [ ] `.wav` audio file
+
+#### meta.yaml fields
+- [ ] `title` — display name for this lock sound
+- [ ] `author` — creator name or handle
+- [ ] `description` — brief description of the lock sound
+- [ ] `tags` — array of tags from `content/tags.yaml` (optional)
+
+#### Naming & structure
+- [ ] Folder placed in `content/locksounds/<slug>/`
+- [ ] Slug is lowercase alphanumeric with hyphens (e.g. `r2d2-beep`)
+- [ ] No file exceeds 50 MB
+
+### Description
+
+<!-- Describe your lock sound: what it sounds like, inspiration, etc. -->

.github/PULL_REQUEST_TEMPLATE/wrap.md

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+## Wrap Submission
+
+**Content type:** Wrap
+
+### Checklist
+
+#### Required files
+- [ ] `meta.yaml` with all required fields
+- [ ] Image file: `.png`, `.jpg`, `.jpeg`, `.webp`, or `.svg`
+
+#### meta.yaml fields
+- [ ] `title` — display name for this wrap design
+- [ ] `author` — creator name or handle
+- [ ] `description` — brief description of the wrap
+- [ ] `tags` — array of tags from `content/tags.yaml` (optional)
+
+#### Naming & structure
+- [ ] Folder placed in `content/wraps/<slug>/`
+- [ ] Slug is lowercase alphanumeric with hyphens (e.g. `matte-black`)
+- [ ] No file exceeds 50 MB
+
+### Description
+
+<!-- Describe your wrap: color scheme, style, which vehicle models it targets, etc. -->