refactor: replace console.log with structured logger calls

Replace raw `console.log`/`console.error` calls across CLI, API
handlers, and module files with structured logger functions (`step`,
`done`, `warn`, `fail`) from the shared logger library.

This improves log consistency, readability, and makes it easier to
control output formatting and log levels from a single place.

src/modules/posts/db.js

@@ -5,6 +5,7 @@
 
 import { query } from '@zen/core/database';
 import { getPostsConfig } from './config.js';
+import { done, info, step } from '../../shared/lib/logger.js';
 
 async function tableExists(tableName) {
   const result = await query(
@@ -23,7 +24,7 @@ async function createPostsCategoryTable() {
   const exists = await tableExists(tableName);
 
   if (exists) {
-    console.log(`- Table already exists: ${tableName}`);
+    info(`Table already exists: ${tableName}`);
     return { created: false, tableName };
   }
 
@@ -42,7 +43,7 @@ async function createPostsCategoryTable() {
   await query(`CREATE INDEX idx_zen_posts_category_post_type ON zen_posts_category(post_type)`);
   await query(`CREATE INDEX idx_zen_posts_category_is_active ON zen_posts_category(is_active)`);
 
-  console.log(`✓ Created table: ${tableName}`);
+  done(`Created table: ${tableName}`);
   return { created: true, tableName };
 }
 
@@ -51,7 +52,7 @@ async function createPostsTable() {
   const exists = await tableExists(tableName);
 
   if (exists) {
-    console.log(`- Table already exists: ${tableName}`);
+    info(`Table already exists: ${tableName}`);
     return { created: false, tableName };
   }
 
@@ -73,7 +74,7 @@ async function createPostsTable() {
   await query(`CREATE INDEX idx_zen_posts_category_id ON zen_posts(category_id)`);
   await query(`CREATE INDEX idx_zen_posts_data_gin ON zen_posts USING GIN (data)`);
 
-  console.log(`✓ Created table: ${tableName}`);
+  done(`Created table: ${tableName}`);
   return { created: true, tableName };
 }
 
@@ -82,7 +83,7 @@ async function createPostsRelationsTable() {
   const exists = await tableExists(tableName);
 
   if (exists) {
-    console.log(`- Table already exists: ${tableName}`);
+    info(`Table already exists: ${tableName}`);
     return { created: false, tableName };
   }
 
@@ -100,7 +101,7 @@ async function createPostsRelationsTable() {
   await query(`CREATE INDEX idx_zen_posts_relations_post_id ON zen_posts_relations(post_id)`);
   await query(`CREATE INDEX idx_zen_posts_relations_related ON zen_posts_relations(related_post_id)`);
 
-  console.log(`✓ Created table: ${tableName}`);
+  done(`Created table: ${tableName}`);
   return { created: true, tableName };
 }
 
@@ -119,18 +120,18 @@ export async function createTables() {
 
   // zen_posts_category must always be created before zen_posts
   // because zen_posts has a FK reference to it
-  console.log('\n--- Posts Categories ---');
+  step('Posts Categories');
   const catResult = await createPostsCategoryTable();
   if (catResult.created) created.push(catResult.tableName);
   else skipped.push(catResult.tableName);
 
-  console.log('\n--- Posts ---');
+  step('Posts');
   const postResult = await createPostsTable();
   if (postResult.created) created.push(postResult.tableName);
   else skipped.push(postResult.tableName);
 
   if (needsRelations) {
-    console.log('\n--- Posts Relations ---');
+    step('Posts Relations');
     const relResult = await createPostsRelationsTable();
     if (relResult.created) created.push(relResult.tableName);
     else skipped.push(relResult.tableName);