docs: complete API sync and documentation audit

Audit all 52 tools and 119 API operations against the OpenAPI spec.
Fix schema mismatches, add missing endpoints, and update all doc surfaces.

OpenAPI spec (apps/api/src/openapi.yaml):
- Add operationId to all 119 operations for SDK code generation
- Add descriptions to 17 operations that only had summaries
- Fix 9 bare error responses with proper content/schema blocks
- Fix wrong $ref on GET /api/v1/settings/{key} 404 (was UnauthorizedError)
- Fix 10 async AI tools using 200 instead of 202 Accepted
- Add missing JXL format to 9 tool enums (convert, collage, stitch, split,
  svg-to-raster, pdf-to-image, optimize-for-web, erase-object, noise-removal)
- Add 3 missing endpoints: POST /api/v1/fetch-urls, GET /api/v1/config/locale,
  POST /api/v1/tools/ai-canvas-expand
- Add missing meme-templates/fonts/{filename} endpoint
- Fix watermark-image and compose: settings not required (all have defaults)
- Fix compare similarity description (0-100 percentage, not 0-1)
- Fix find-duplicates: add nullable thumbnail, add skippedFiles response field
- Fix upscale format default ("auto" not "png"), add clientJobId fields
- Fix restore-photo: remove phantom mode param, fix denoiseStrength default,
  add missing colorizeStrength
- Fix smart-crop: add 5 missing parameter defaults
- Add missing params: image-enhancement deepEnhance, transparency-fixer
  removeWatermark, image-to-pdf collate, image-to-base64 jxl enum
- Fix files/{id}/thumbnail security (requires auth, was marked public)
- Annotate 7 empty description strings in pipeline/role schemas

Documentation surfaces:
- VitePress config: "50 tools" to "51 tools" (2 locations)
- README: add OIDC/SSO docs link
- getting-started.md: add Color Blindness Simulation to tool table
- database.md: fix hash descriptions (bcrypt/SHA-256 to scrypt)

apps/docs/.vitepress/config.mts

@@ -5,7 +5,7 @@ import pkg from "../package.json";
 export default defineConfig({
   title: "SnapOtter",
   description:
-    "Documentation for SnapOtter - A Self Hosted Image Manipulator. 50 tools, local AI, pipelines, REST API.",
+    "Documentation for SnapOtter - A Self Hosted Image Manipulator. 51 tools, local AI, pipelines, REST API.",
   base: "/",
   appearance: { initialValue: "light" },
   srcDir: ".",
@@ -53,7 +53,7 @@ export default defineConfig({
 `,
         customTemplateVariables: {
           description:
-            "SnapOtter is a self-hosted, open-source image processing platform with 50 tools including AI/ML. Runs in a single Docker container with GPU auto-detection.",
+            "SnapOtter is a self-hosted, open-source image processing platform with 51 tools including AI/ML. Runs in a single Docker container with GPU auto-detection.",
           details:
             "Resize, compress, convert, remove backgrounds, upscale, run OCR, and more - without sending images to external services.",
         },

apps/docs/guide/database.md

@@ -14,7 +14,7 @@ Stores user accounts. Created automatically on first run from `DEFAULT_USERNAME`
 |---|---|---|
 | `id` | integer | Primary key, auto-increment |
 | `username` | text | Unique, required |
-| `passwordHash` | text | bcrypt hash |
+| `passwordHash` | text | scrypt hash |
 | `role` | text | `admin` or `user` |
 | `mustChangePassword` | integer | Boolean flag for forced password reset |
 | `createdAt` | text | ISO timestamp |
@@ -49,7 +49,7 @@ API keys for programmatic access. The raw key is shown once on creation; only th
 |---|---|---|
 | `id` | integer | Primary key, auto-increment |
 | `userId` | integer | Foreign key to `users.id` |
-| `keyHash` | text | SHA-256 hash of the key |
+| `keyHash` | text | scrypt hash of the key |
 | `name` | text | User-provided label |
 | `createdAt` | text | ISO timestamp |
 | `lastUsedAt` | text | Updated on each authenticated request |

apps/docs/guide/getting-started.md

@@ -70,7 +70,7 @@ pnpm dev
 |----------|-------|
 | **Essentials** | Resize, Crop, Rotate & Flip, Convert, Compress |
 | **Optimization** | Optimize for Web, Strip Metadata, Edit Metadata, Bulk Rename, Image to PDF, Favicon Generator |
-| **Adjustments** | Adjust Colors, Sharpening, Replace Color |
+| **Adjustments** | Adjust Colors, Sharpening, Replace Color, Color Blindness Simulation |
 | **AI Tools** | Remove Background, Upscale, Erase Object, OCR, Blur Faces, Smart Crop, Image Enhancement, Enhance Faces, Colorize, Noise Removal, Red Eye Removal, Restore Photo, Passport Photo, Content-Aware Resize, PNG Transparency Fixer |
 | **Watermark & Overlay** | Text Watermark, Image Watermark, Text Overlay, Image Composition |
 | **Utilities** | Image Info, Compare, Find Duplicates, Color Palette, QR Code Generator, Barcode Reader, Image to Base64 |