Add product editor audit log, fix bug that would overwrite editor fields if edited too soon after load, add audit log ui

inventory-server/migrations/004_create_product_editor_audit_log.sql

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+-- Migration: Create product_editor_audit_log table
+-- Permanent audit trail of all product editor API submissions
+-- Run this against your PostgreSQL database
+
+CREATE TABLE IF NOT EXISTS product_editor_audit_log (
+  id SERIAL PRIMARY KEY,
+
+  -- Who made the edit
+  user_id INTEGER NOT NULL,
+  username VARCHAR(255),
+
+  -- Which product
+  pid INTEGER NOT NULL,
+
+  -- What was submitted
+  action VARCHAR(50) NOT NULL,               -- 'product_edit', 'image_changes', 'taxonomy_set'
+  request_payload JSONB NOT NULL,            -- The exact payload sent to the external API
+  target_endpoint VARCHAR(255),              -- The API URL that was called
+
+  -- What came back
+  success BOOLEAN NOT NULL,
+  response_payload JSONB,                    -- Full API response
+  error_message TEXT,                        -- Extracted error message on failure
+
+  -- Metadata
+  duration_ms INTEGER,                       -- How long the API call took
+  created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
+);
+
+-- Index for looking up edits by product
+CREATE INDEX IF NOT EXISTS idx_pe_audit_log_pid
+  ON product_editor_audit_log (pid);
+
+-- Index for looking up edits by user
+CREATE INDEX IF NOT EXISTS idx_pe_audit_log_user_id
+  ON product_editor_audit_log (user_id);
+
+-- Index for time-based queries
+CREATE INDEX IF NOT EXISTS idx_pe_audit_log_created_at
+  ON product_editor_audit_log (created_at DESC);
+
+-- Composite index for product + time queries
+CREATE INDEX IF NOT EXISTS idx_pe_audit_log_pid_created
+  ON product_editor_audit_log (pid, created_at DESC);
+
+-- Composite index for user + time queries
+CREATE INDEX IF NOT EXISTS idx_pe_audit_log_user_created
+  ON product_editor_audit_log (user_id, created_at DESC);
+
+COMMENT ON TABLE product_editor_audit_log IS 'Permanent audit log of all product editor API submissions';
+COMMENT ON COLUMN product_editor_audit_log.action IS 'Type of edit: product_edit, image_changes, or taxonomy_set';
+COMMENT ON COLUMN product_editor_audit_log.request_payload IS 'Exact payload sent to the external API';
+COMMENT ON COLUMN product_editor_audit_log.response_payload IS 'Full response received from the external API';
+COMMENT ON COLUMN product_editor_audit_log.duration_ms IS 'Round-trip time of the API call in milliseconds';