docs: add PCD manifest specification

docs/manifest.md

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+# Manifest Specification
+
+Every Profilarr Compliant Database must include a `pcd.json` manifest file in
+its root directory. This file defines the database's identity, compatibility,
+and dependencies.
+
+## Required Fields
+
+| Field                       | Description                                                                                   |
+| --------------------------- | --------------------------------------------------------------------------------------------- |
+| `name`                      | Unique identifier for the database (lowercase, hyphens preferred)                             |
+| `version`                   | Semantic version of the database (MAJOR.MINOR.PATCH)                                          |
+| `description`               | Short summary of what the database provides                                                   |
+| `dependencies`              | Object mapping dependency names to semver ranges. All PCDs must depend on `schema` at minimum |
+| `profilarr.minimum_version` | Minimum Profilarr version required to use this database                                       |
+
+## Optional Fields
+
+| Field          | Description                                                                                                                        |
+| -------------- | ---------------------------------------------------------------------------------------------------------------------------------- |
+| `arr_types`    | Array of supported arr applications (`["radarr"]`, `["sonarr"]`, or `["radarr", "sonarr"]`). If omitted, assumes all are supported |
+| `authors`      | Array of contributor objects with name and optional email                                                                          |
+| `license`      | SPDX license identifier                                                                                                            |
+| `repository`   | Git repository URL                                                                                                                 |
+| `dependencies` | Can include other PCDs in addition to the schema, enabling layered databases                                                       |
+| `tags`         | Array of descriptive keywords for discovery                                                                                        |
+| `links`        | External resource URLs (homepage, documentation, issues)                                                                           |
+
+## Example
+
+```json
+{
+    "name": "db",
+    "version": "2.1.35",
+    "description": "Seraphys' OCD Playground",
+    "arr_types": ["radarr", "sonarr", "whisparr"],
+
+    "dependencies": {
+        "schema": "^1.1.0"
+    },
+
+    "authors": [
+        {
+            "name": "Dictionarry Team",
+            "email": "team@dictionarry.dev"
+        }
+    ],
+
+    "license": "MIT",
+    "repository": "https://github.com/dictionarry-hub/database",
+
+    "tags": ["4k", "hdr", "remux", "quality", "archival"],
+
+    "links": {
+        "homepage": "https://dictionarry.dev",
+        "issues": "https://github.com/dictionarry-hub/db/issues"
+    },
+
+    "profilarr": {
+        "minimum_version": "2.0.0"
+    }
+}
+```

pcd.json

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+{
+  "name": "schema",
+  "version": "1.0.0",
+  "description": "Base schema for all Profilarr Compliant Databases - defines the structural foundation that all PCDs build upon",
+  "arr_types": ["radarr", "sonarr"],
+  
+  "authors": [
+    {
+      "name": "Dictionarry Team"
+    }
+  ],
+  
+  "license": "MIT",
+  "repository": "https://github.com/dictionarry-hub/schema",
+  
+  "tags": ["schema", "foundation", "base"],
+  
+  "links": {
+    "homepage": "https://dictionarry.dev",
+    "issues": "https://github.com/dictionarry-hub/schema/issues"
+  }
+}