Implement AsciiDoc and TipTap conversion logic, including new Admonition node and CodeBlock extension; add DiffViewer and HistoryPanel components for document version comparison; introduce password hashing utility with SHA-256.

backend/internal/graph/schema.graphql

@@ -22,6 +22,9 @@ type Query {
 
   # Raw content of a document at a specific commit.
   documentAtCommit(slug: String!, hash: String!): String!
+
+  # Whether the current storage path has uncommitted files.
+  repoStatus: RepoStatus!
 }
 
 type Mutation {
@@ -51,6 +54,9 @@ type Mutation {
 
   # Change the current user's password.
   changePassword(old: String!, new: String!): Boolean!
+
+  # Commit all uncommitted files in the storage path.
+  initCommit(message: String!): Boolean!
 }
 
 # ── Types ──────────────────────────────────────────────────────────────────────
@@ -100,6 +106,12 @@ type CommitEntry {
   email:   String!
   date:    String!
   subject: String!
+  added:   Int!
+  removed: Int!
+}
+
+type RepoStatus {
+  hasUncommitted: Boolean!
 }
 
 # ── Inputs ─────────────────────────────────────────────────────────────────────