feat(workflows): expand template library from 9 to 22 + multiline string cleanup (#36)

* feat(workflows): add 13 workflow templates across engineering, business, and productivity

Engineering:
- bug-triage: reproduce path → root cause → fix plan
- api-design: resource model → endpoints → OpenAPI spec
- incident-postmortem: timeline → RCA → full postmortem report
- test-generation: code analysis → edge cases → full test suite
- refactor-plan: smell analysis → prioritised opportunities → migration plan

Business:
- competitor-analysis: profiles → SWOT → strategy report
- product-spec: problem definition → user stories → full PRD
- market-research: landscape → segments → research report

Productivity/Thinking:
- meeting-summary: raw notes → structured summary → follow-up email
- decision-matrix: criteria → weighted scoring → recommendation memo
- learning-plan: gap analysis → roadmap → week-1 day-by-day plan
- job-application: job analysis → tailored resume → cover letter → interview prep
- blog-post: research → outline → draft → SEO optimisation

Closes #1912 on librefang/librefang

* fix(workflows): overhaul existing 9 templates

- data-pipeline: redesigned — original 'extract from URL' step was
  broken (LLMs cannot fetch URLs); replaced with paste-data approach
  (profile → clean_transform → analyse) with analysis_goal parameter
- translate-polish: added target_language and register parameters;
  added back-translation step for accuracy verification
- weekly-report: added team/audience parameters, richer extraction
  step, added Metrics and Notes sections
- content-pipeline: added audience/tone parameters, added outline step
  between research and writing
- content-review: fix category 'content' → 'creation'
- customer-support: fix category 'support' → 'business'

* style(workflows): convert all prompt_template strings to TOML multiline syntax

Replace \n escape sequences with real newlines using triple-quote
multiline strings ("""...""") across all 22 workflow templates.
No content changes — formatting only.

* style(hands): replace \n escape in reddit writer format example with multiline code block

workflows/blog-post.toml

@@ -0,0 +1,99 @@
+id = "blog-post"
+name = "Blog Post Writer"
+description = "Research a topic, build a structured outline, write a full-length blog post, then optimise for SEO."
+category = "creation"
+tags = ["writing", "blog", "seo", "content"]
+
+[i18n.zh]
+name = "博客文章撰写"
+description = "调研主题，构建结构化提纲，撰写完整博客文章，并进行 SEO 优化。"
+
+[[parameters]]
+name = "topic"
+description = "Blog post topic or working title"
+param_type = "string"
+required = true
+
+[[parameters]]
+name = "audience"
+description = "Target audience and their expertise level"
+param_type = "string"
+required = false
+default = "general audience"
+
+[[parameters]]
+name = "tone"
+description = "Desired tone (e.g. technical, conversational, authoritative)"
+param_type = "string"
+required = false
+default = "informative and engaging"
+
+[[steps]]
+name = "research"
+prompt_template = """
+You are a research journalist. For the blog topic below, compile:
+1. Key facts, statistics, and data points (with source type)
+2. Common misconceptions to debunk
+3. Expert perspectives and contrasting views
+4. Recent developments or trends
+5. Concrete examples and case studies
+6. Angles that haven't been covered well in existing content
+
+Topic: {{topic}}
+Audience: {{audience}}
+"""
+
+[[steps]]
+name = "outline"
+prompt_template = """
+You are a content strategist. Create a detailed blog post outline:
+- Compelling headline (3 options)
+- Hook / opening angle
+- H2 sections with H3 subsections
+- Key point per section
+- Data or example to use in each section
+- Conclusion and CTA
+
+Target length: 1200-1800 words.
+Tone: {{tone}}
+Audience: {{audience}}
+
+Research:
+{{research}}
+"""
+depends_on = ["research"]
+
+[[steps]]
+name = "draft"
+prompt_template = """
+Write the full blog post following the outline. Guidelines:
+- Open with a hook that immediately addresses the reader's pain or curiosity
+- Use short paragraphs (3-4 sentences max)
+- Include the statistics and examples from research
+- Use subheadings to aid scannability
+- End with a clear takeaway and one actionable CTA
+- Tone: {{tone}}
+
+Outline:
+{{outline}}
+
+Research:
+{{research}}
+"""
+depends_on = ["outline", "research"]
+
+[[steps]]
+name = "seo_optimise"
+prompt_template = """
+SEO-optimise the blog post:
+1. **Primary keyword** — identify the best target keyword
+2. **Meta title** (under 60 chars) and **meta description** (under 155 chars)
+3. **Keyword placement** — suggest where to naturally insert the primary keyword and 3 secondary keywords
+4. **Internal link opportunities** — topics to link to
+5. **Image alt text suggestions** — 2-3 descriptive alts
+6. **Revised headline** if needed for keyword inclusion
+
+Draft:
+{{draft}}
+"""
+depends_on = ["draft"]