feat(openapi): refactor into indiv. files to match API & tpl routing

public/openapi/api/topic/pagination.yaml

@@ -0,0 +1,19 @@
+get:
+  tags:
+    - topics
+  summary: Get topic pagination data
+  description: This route retrieves pagination data for a given topic. It is used mainly client-side, as it return data necessary to update a pagination block client-side.
+  parameters:
+    - name: topic_id
+      in: path
+      required: true
+      schema:
+        type: string
+      example: 1
+  responses:
+    "200":
+      description: ""
+      content:
+        application/json:
+          schema:
+            $ref: ../../components/schemas/Pagination.yaml#/Pagination

public/openapi/api/topic/teaser.yaml

@@ -0,0 +1,18 @@
+get:
+  tags:
+    - topics
+  summary: Get a topic's teaser post
+  parameters:
+    - name: topic_id
+      in: path
+      required: true
+      schema:
+        type: string
+      example: 1
+  responses:
+    "200":
+      description: "A JSON object containing the teaser post for a topic"
+      content:
+        application/json:
+          schema:
+            $ref: ../../components/schemas/PostsObject.yaml#/PostsObject

public/openapi/api/topic/thumb/upload.yaml

@@ -0,0 +1,35 @@
+post:
+  tags:
+    - topics
+  summary: Upload topic thumb
+  requestBody:
+    required: true
+    content:
+      multipart/form-data:
+        schema:
+          type: object
+          properties:
+            files:
+              type: array
+              items:
+                type: string
+                format: binary
+          required:
+            - files
+  responses:
+    "200":
+      description: "Image uploaded"
+      content:
+        application/json:
+          schema:
+            type: object
+            properties:
+              name:
+                type: string
+                description: The filename
+              url:
+                type: string
+                description: URL of the uploaded image for use client-side
+              path:
+                type: string
+                description: Path to the file in the local file system

public/openapi/api/topic/tid.yaml

@@ -0,0 +1,62 @@
+get:
+  tags:
+    - shorthand
+  summary: Get topic data
+  parameters:
+    - name: id
+      in: path
+      required: true
+      schema:
+        type: string
+      example: 1
+  responses:
+    "200":
+      description: "A JSON object containing topic data"
+      content:
+        application/json:
+          schema:
+            type: object
+            properties:
+              tid:
+                type: number
+              uid:
+                type: number
+              cid:
+                type: number
+              mainPid:
+                type: number
+              teaserPid:
+                type: number
+                nullable: true
+              title:
+                type: string
+              slug:
+                type: string
+              timestamp:
+                type: number
+              lastposttime:
+                type: number
+              postcount:
+                type: number
+              viewcount:
+                type: number
+              deleted:
+                type: number
+              locked:
+                type: number
+              pinned:
+                type: number
+              upvotes:
+                type: number
+              downvotes:
+                type: number
+              deleterUid:
+                type: number
+              titleRaw:
+                type: string
+              timestampISO:
+                type: string
+              lastposttimeISO:
+                type: string
+              votes:
+                type: number