feat: add resumes table and jobs.resume_id column (migration 005)

migrations/005_resumes_table.sql

@@ -0,0 +1,17 @@
+-- 005_resumes_table.sql
+-- Resume library: named saved resumes per user (optimizer output, imports, manual)
+
+CREATE TABLE IF NOT EXISTS resumes (
+    id          INTEGER PRIMARY KEY AUTOINCREMENT,
+    name        TEXT NOT NULL,
+    source      TEXT NOT NULL DEFAULT 'manual',
+    job_id      INTEGER REFERENCES jobs(id),
+    text        TEXT NOT NULL,
+    struct_json TEXT,
+    word_count  INTEGER,
+    is_default  INTEGER NOT NULL DEFAULT 0,
+    created_at  TEXT NOT NULL DEFAULT (datetime('now')),
+    updated_at  TEXT NOT NULL DEFAULT (datetime('now'))
+);
+
+ALTER TABLE jobs ADD COLUMN resume_id INTEGER REFERENCES resumes(id);