feat(knowledge): add tag management API (KNOW-003)

- Add Tag DTOs (CreateTagDto, UpdateTagDto) with validation
- Implement TagsService with CRUD operations
- Add TagsController with authenticated endpoints
- Support automatic slug generation from tag names
- Add workspace isolation for tags
- Include entry count in tag responses
- Add findOrCreateTags method for entry creation/update
- Implement comprehensive test coverage (29 tests passing)

Endpoints:
- GET /api/knowledge/tags - List workspace tags
- POST /api/knowledge/tags - Create tag
- GET /api/knowledge/tags/:slug - Get tag by slug
- PUT /api/knowledge/tags/:slug - Update tag
- DELETE /api/knowledge/tags/:slug - Delete tag
- GET /api/knowledge/tags/:slug/entries - List entries with tag

Related: KNOW-003

pnpm-lock.yaml

@@ -56,6 +56,9 @@ importers:
       '@prisma/client':
         specifier: ^6.19.2
         version: 6.19.2([email protected]([email protected])([email protected]))([email protected])
+      '@types/marked':
+        specifier: ^6.0.0
+        version: 6.0.0
       better-auth:
         specifier: ^1.4.17
         version: 1.4.17(@prisma/[email protected]([email protected]([email protected])([email protected]))([email protected]))([email protected])([email protected](@prisma/[email protected]([email protected]([email protected])([email protected])))(@types/[email protected])([email protected])([email protected])([email protected])([email protected]([email protected])([email protected])))([email protected](@babel/[email protected])([email protected]([email protected]))([email protected]))([email protected])([email protected]([email protected])([email protected]))([email protected]([email protected]))([email protected])([email protected](@types/[email protected])([email protected])([email protected])([email protected])([email protected]))
@@ -65,12 +68,18 @@ importers:
       class-validator:
         specifier: ^0.14.3
         version: 0.14.3
+      marked:
+        specifier: ^17.0.1
+        version: 17.0.1
       reflect-metadata:
         specifier: ^0.2.2
         version: 0.2.2
       rxjs:
         specifier: ^7.8.1
         version: 7.8.2
+      slugify:
+        specifier: ^1.6.6
+        version: 1.6.6
     devDependencies:
       '@better-auth/cli':
         specifier: ^1.4.17
@@ -1584,6 +1593,10 @@ packages:
   '@types/[email protected]':
     resolution: {integrity: sha512-5+fP8P8MFNC+AyZCDxrB2pkZFPGzqQWUzpSeuuVLvm8VMcorNYavBqoFcxK8bQz4Qsbn4oUEEem4wDLfcysGHA==}
 
+  '@types/[email protected]':
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+    deprecated: This is a stub types definition. marked provides its own type definitions, so you do not need this installed.
+
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     resolution: {integrity: sha512-MciR4AKGHWl7xwxkBa6xUGxQJ4VBOmPTF7sL+iGzuahOFaO0jHCsuEfS80pan1ef4gWId1oWOweIhrDEYLuaOw==}
 
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     engines: {node: '>=10'}
 
+  [email protected]:
+    resolution: {integrity: sha512-boeBdiS0ghpWcSwoNm/jJBwdpFaMnZWRzjA6SkUMYb40SVaN1x7mmfGKp0jvexGcx+7y2La5zRZsYFZI6Qpypg==}
+    engines: {node: '>= 20'}
+    hasBin: true
+
   [email protected]:
     resolution: {integrity: sha512-/IXtbwEk5HTPyEwyKX6hGkYXxM9nbj64B+ilVJnC/R6B0pH5G4V3b0pVbL7DBj4tkhBAppbQUlf6F6Xl9LHu1g==}
     engines: {node: '>= 0.4'}
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     resolution: {integrity: sha512-bLGGlR1QxBcynn2d5YmDX4MGjlZvy2MRBDRNHLJ8VI6l6+9FUiyTFNJ0IveOSP0bcXgVDPRcfGqA0pjaqUpfVg==}
 
+  [email protected]:
+    resolution: {integrity: sha512-h+z7HKHYXj6wJU+AnS/+IH8Uh9fdcX1Lrhg1/VMdf9PwoBQXFcXiAdsy2tSK0P6gKwJLXp02r90ahUCqHk9rrw==}
+    engines: {node: '>=8.0.0'}
+
   [email protected]:
     resolution: {integrity: sha512-UXWMKhLOwVKb728IUtQPXxfYU+usdybtUrK/8uGE8CQMvrhOpwvzDBwj0QhSL7MQc7vIsISBG8VQ8+IDQxpfQA==}
     engines: {node: '>=0.10.0'}
@@ -5518,6 +5540,10 @@ snapshots:
 
   '@types/[email protected]': {}
 
+  '@types/[email protected]':
+    dependencies:
+      marked: 17.0.1
+
   '@types/[email protected]':
     dependencies:
       undici-types: 6.21.0
@@ -7011,6 +7037,8 @@ snapshots:
     dependencies:
       semver: 7.7.3
 
+  [email protected]: {}
+
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   [email protected]: {}
@@ -7668,6 +7696,8 @@ snapshots:
 
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+  [email protected]: {}
+
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   [email protected]: