feat: initial shared library extraction

Contains shared infrastructure for all coop services:
- shared/ (factory, urls, user_loader, context, internal_api, jinja_setup)
- models/ (User, Order, Calendar, Ticket, Product, Ghost CMS)
- db/ (SQLAlchemy async session, base)
- suma_browser/app/ (csrf, middleware, errors, authz, redis_cacher, payments, filters, utils)
- suma_browser/templates/ (shared base layouts, macros, error pages)
- static/ (CSS, JS, fonts, images)
- alembic/ (database migrations)
- config/ (app-config.yaml)
- editor/ (Lexical editor Node.js build)
- requirements.txt

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

static/styles/blog-content.css

@@ -0,0 +1,165 @@
+
+
+
+.blog-content {
+    margin: 0 auto;
+    color: #222;
+    font-family: var(--font-sans);
+    line-height: 1.6;
+    font-size: 1.2rem;
+}
+
+.blog-content pre {
+    background-color: #f8f9fa;      /* very light gray */
+    color: #1f2937;                 /* dark gray */
+    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
+    font-size: 1.2rem;
+    line-height: 1.5;
+
+    padding: 1rem 1.25rem;
+    border-radius: 0.5rem;
+    border: 1px solid #d1d5db;      /* gray-300-ish */
+
+    overflow-x: auto;
+    max-width: 100%;
+    box-sizing: border-box;
+    margin: 1.5rem 0;
+}
+
+.blog-content code {
+    font-family: inherit;
+    font-size: inherit;
+    color: inherit;
+    background: none;
+    padding: 0;
+}
+
+
+.blog-content video,
+.blog-content iframe,
+.blog-content img {
+    display: block;
+    margin-left: auto;
+    margin-right: auto;
+}
+
+
+/* Paragraphs */
+.blog-content p {
+    text-align: justify;
+    overflow-wrap: anywhere;           /* modern, nicer than break-word */
+    word-break: normal;                /* avoid aggressive breaking */
+    hyphens: auto;
+    -webkit-hyphens: auto;
+    -ms-hyphens: auto;
+    margin: 2rem 0;
+}
+
+.blog-content .kg-card {
+    margin-top:.5rem;
+    margin-bottom:1rem;
+}
+
+
+/* Headings */
+.blog-content h1,
+.blog-content h2,
+.blog-content h3,
+.blog-content h4,
+.blog-content h5,
+.blog-content h6 {
+    font-weight: 600;
+    line-height: 1.3;
+    color: #000;
+    margin-top: 1em;
+    margin-bottom: 0.6em;
+}
+
+.blog-content h1 { font-size: 4rem; }
+.blog-content h2 { font-size: 3rem; }
+.blog-content h3 { font-size: 2.5rem; }
+.blog-content h4 { font-size: 2rem; }
+.blog-content h5 { font-size: 1.5rem;  }
+.blog-content h6 { font-size: 1rem; text-transform: uppercase; letter-spacing: 0.04em; }
+
+/* Lists */
+.blog-content ul,
+.blog-content ol {
+    margin: 0 0 1em 1.5em;
+    padding: 0;
+}
+
+.blog-content li {
+    margin: 0.4em 0;
+}
+
+/* Blockquotes */
+.blog-content blockquote {
+    border-left: 4px solid #ddd;
+    padding-left: 1em;
+    color: #555;
+    font-style: italic;
+    margin: 1.5em 0;
+}
+
+/* Images */
+.blog-content img {
+    max-width: 100%;
+    height: auto;
+    display: block;
+    margin: 1.5em auto;
+    border-radius: 4px;
+}
+
+/* Figures & captions */
+.blog-content figure {
+    margin: 1.5em 0;
+    text-align: center;
+}
+
+.blog-content figcaption {
+    color: #666;
+    font-size: 0.9rem;
+    line-height: 1.4;
+    margin-top: 0.5em;
+}
+
+/* Links */
+.blog-content a {
+    color: #0055cc;
+    text-decoration: underline;
+    text-decoration-thickness: 1px;
+    text-underline-offset: 2px;
+}
+
+.blog-content a:hover,
+.blog-content a:focus {
+    text-decoration: none;
+}
+
+/* Horizontal rule */
+.blog-content hr {
+    border: 0;
+    border-top: 1px solid #ddd;
+    margin: 2em 0;
+} 
+
+
+/* Generic YouTube embeds */
+iframe[src*="youtube.com"], iframe[src*="youtube-nocookie.com"] {
+  display: block;
+  width: 50% !important;
+  max-width: 50%;
+  aspect-ratio: 16 / 9;
+  height: auto;
+  border: 0;
+}
+
+/* (Optional) target Ghost’s embed card wrapper specifically */
+.kgg-embed-card iframe {
+  display: block;
+  width: 100% !important;
+  aspect-ratio: 16 / 9;
+  height: auto;
+  border: 0;
+}