Add What's New admin console and changelog script integration (#5804)

- Add CRUD handlers for managing what's-new entries stored in S3
- Add whats_new.html template with add/edit/delete forms
- Add navigation link to layout.html
- Add player-friendly summary generation to generate_changelog.sh
- Add seed JSON file for initial data

The admin console at /whats-new allows managing changelog entries
that will be displayed to players in the Unity client. The script
integration generates summaries and opens the admin console with
pre-populated content after sending weekly changelogs.

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

scripts/generate_changelog.sh

@@ -373,6 +373,115 @@ send_email_fastmail() {
     echo "Email sent successfully"
 }
 
+# Generate player-friendly "What's New" summary
+# This creates a short summary suitable for in-game display
+generate_whats_new_summary() {
+    local pr_file="$1"
+    local output_file="/tmp/eagle0_whats_new_$$.txt"
+
+    echo "Generating player-friendly What's New summary..." >&2
+
+    # Create a prompt for player-facing summary
+    local prompt_file="/tmp/eagle0_whats_new_prompt_$$.txt"
+
+    cat > "$prompt_file" <<'WHATS_NEW_PROMPT'
+Based on these merged PRs, write a SHORT player-friendly summary.
+Focus only on changes players will notice. Ignore internal/technical changes.
+
+Output format (exactly this format, no markdown, no extra text):
+TITLE: (5-10 words describing the main change)
+DESCRIPTION: (1-2 sentences, what players can now do differently)
+CATEGORY: (one of: feature, improvement, fix, content)
+
+If there are multiple notable player-visible changes, pick the single most important one.
+If there are no player-visible changes at all, output exactly: NONE
+
+Examples of good output:
+TITLE: Bug Reporting
+DESCRIPTION: You can now report bugs directly from the Settings menu.
+CATEGORY: feature
+
+TITLE: Faster Reconnection
+DESCRIPTION: The game now reconnects more smoothly after network interruptions.
+CATEGORY: improvement
+
+Here are the merged PRs:
+
+WHATS_NEW_PROMPT
+
+    cat "$pr_file" >> "$prompt_file"
+
+    # Use Claude CLI to generate the summary
+    if ! command -v claude &> /dev/null; then
+        echo "NONE"
+        rm -f "$prompt_file"
+        return
+    fi
+
+    cat "$prompt_file" | claude --print > "$output_file" 2>/dev/null
+
+    rm -f "$prompt_file"
+
+    # Check if the output is NONE
+    if grep -q "^NONE$" "$output_file"; then
+        echo "NONE"
+        rm -f "$output_file"
+        return
+    fi
+
+    # Return the output
+    cat "$output_file"
+    rm -f "$output_file"
+}
+
+# URL encode a string for use in query parameters
+urlencode() {
+    local string="$1"
+    local strlen=${#string}
+    local encoded=""
+    local pos c o
+
+    for (( pos=0 ; pos<strlen ; pos++ )); do
+        c=${string:$pos:1}
+        case "$c" in
+            [-_.~a-zA-Z0-9] ) o="${c}" ;;
+            * )               printf -v o '%%%02x' "'$c"
+        esac
+        encoded+="${o}"
+    done
+    echo "${encoded}"
+}
+
+# Open the admin console with pre-populated what's new content
+open_whats_new_preview() {
+    local title="$1"
+    local description="$2"
+    local category="$3"
+
+    local encoded_title=$(urlencode "$title")
+    local encoded_desc=$(urlencode "$description")
+    local encoded_cat=$(urlencode "$category")
+
+    local preview_url="https://admin.eagle0.net/whats-new?preview=true&title=${encoded_title}&description=${encoded_desc}&category=${encoded_cat}"
+
+    echo ""
+    echo "=== What's New Preview ==="
+    echo "Title: $title"
+    echo "Description: $description"
+    echo "Category: $category"
+    echo ""
+    echo "Opening admin console preview..."
+
+    # Open the URL in the default browser
+    if [[ "$(uname)" == "Darwin" ]]; then
+        open "$preview_url"
+    elif command -v xdg-open &> /dev/null; then
+        xdg-open "$preview_url"
+    else
+        echo "Preview URL: $preview_url"
+    fi
+}
+
 # Update the tag to mark this run
 update_tag() {
     echo "Updating $TAG_NAME tag..."
@@ -462,6 +571,26 @@ main() {
 
         # Update tag for next run
         update_tag
+
+        # Generate player-friendly What's New summary and open admin preview
+        echo ""
+        echo "Generating What's New summary for in-game display..."
+        whats_new_output=$(generate_whats_new_summary "$pr_file")
+
+        if [[ "$whats_new_output" != "NONE" ]]; then
+            # Parse the output
+            title=$(echo "$whats_new_output" | grep "^TITLE:" | sed 's/^TITLE:[[:space:]]*//')
+            description=$(echo "$whats_new_output" | grep "^DESCRIPTION:" | sed 's/^DESCRIPTION:[[:space:]]*//')
+            category=$(echo "$whats_new_output" | grep "^CATEGORY:" | sed 's/^CATEGORY:[[:space:]]*//')
+
+            if [[ -n "$title" && -n "$description" ]]; then
+                open_whats_new_preview "$title" "$description" "$category"
+            else
+                echo "Could not parse What's New output, skipping preview"
+            fi
+        else
+            echo "No player-visible changes detected, skipping What's New preview"
+        fi
     fi
 
     echo ""